$121+ Cheap flights from Washington, D.C. (WAS) to Seattle (SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEA
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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Find cheap flights from Washington, D.C. to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Washington, D.C. to Seattle/Tacoma Intl are usually found in February or January, booked 55 days in advance, depart on a Wednesday or Tuesday and return on a Thursday
Cheap flight deals from Washington, D.C. to Seattle
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Cheapest flights from Washington, D.C. to SeattleExplore the most affordable flight options available from Washington, D.C. to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
Explore the most affordable flight options available from Washington, D.C. to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am -
1 stop30h 42m
Mon 10/129:16 pm -
1 stop30h 04m
Deal found 9/4![Frontier logo]()
$281
This United Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:45 pm -
Nonstop5h 52m
Thu 10/158:25 am -
Nonstop5h 06m
Deal found 9/7![United Airlines logo]()
$282
This American Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:58 pm -
1 stop8h 38m
Sun 10/411:57 pm -
1 stop8h 50m
Deal found 9/7![American Airlines logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:00 am -
1 stop11h 12m
Fri 10/234:27 pm -
1 stop16h 37m
Deal found 9/8![Frontier logo]()
$284
This American Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:25 am -
1 stop11h 12m
Sat 10/104:37 pm -
1 stop9h 55m
Deal found 9/5![American Airlines logo]()
$287
This American Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:20 am -
1 stop9h 32m
Sat 10/1011:59 pm -
1 stop8h 00m
Deal found 9/4![American Airlines logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:57 pm -
Nonstop5h 47m
Mon 10/59:36 pm -
Nonstop5h 04m
Deal found 9/6![Alaska Airlines logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:00 pm -
1 stop24h 12m
Mon 11/98:09 pm -
2 stops17h 38m
Deal found 9/4![Frontier logo]()
$289
This Expedia deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:00 am -
Nonstop5h 55m
Wed 12/91:51 pm -
Nonstop5h 08m
Deal found 9/7![Alaska Airlines logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:00 am -
Nonstop5h 37m
Wed 10/73:56 pm -
Nonstop5h 03m
Deal found 9/6![Alaska Airlines logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:00 am -
1 stop11h 08m
Fri 10/24:27 pm -
1 stop16h 44m
Deal found 9/7![Frontier logo]()
$293
This United Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:45 pm -
Nonstop5h 52m
Fri 10/911:14 pm -
Nonstop5h 03m
Deal found 9/4![United Airlines logo]()
$295
Best flights from Washington, D.C. to SeattleDiscover carefully curated flight deals from Washington, D.C. to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
Discover carefully curated flight deals from Washington, D.C. to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
This Delta deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/87:00 am -
1 stop10h 44m
Wed 12/94:30 pm -
Nonstop5h 01m
Deal found 9/7![Delta logo]()
$297
This United Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:45 pm -
Nonstop5h 52m
Thu 10/811:14 pm -
Nonstop5h 03m
Deal found 9/6![United Airlines logo]()
$308
This Southwest deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:00 am -
2 stops10h 50m
Sun 11/225:30 am -
1 stop6h 45m
Deal found 9/4![Southwest logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/117:02 am -
Nonstop5h 42m
Mon 10/269:36 pm -
Nonstop5h 04m
Deal found 9/7![Alaska Airlines logo]()
$347
This United Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:45 pm -
Nonstop5h 52m
Mon 10/1211:14 pm -
Nonstop5h 03m
Deal found 9/6![United Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/711:40 am -
2 stops10h 25m
Tue 10/2012:10 am -
1 stop11h 10m
Deal found 9/7![Southwest logo]()
$348
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:03 am -
Nonstop5h 36m
Sat 10/103:56 pm -
Nonstop5h 03m
Deal found 9/5![Alaska Airlines logo]()
$363
This Delta deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3010:00 pm -
1 stop13h 58m
Tue 10/137:20 am -
Nonstop5h 03m
Deal found 9/5![Delta logo]()
$376
This United Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:50 pm -
Nonstop6h 06m
Sun 11/18:09 am -
Nonstop4h 59m
Deal found 9/7![United Airlines logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:00 am -
Nonstop5h 50m
Fri 11/278:15 am -
Nonstop4h 58m
Deal found 9/8![Alaska Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:25 pm -
2 stops11h 05m
Tue 10/612:10 am -
1 stop11h 10m
Deal found 9/4![Southwest logo]()
$388
This Delta deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/264:45 pm -
Nonstop5h 40m
Sat 10/37:20 am -
Nonstop5h 12m
Deal found 9/5![Delta logo]()
$392
This United Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/23:36 pm -
1 stop9h 23m
Mon 10/57:25 pm -
1 stop8h 36m
Deal found 9/6![United Airlines logo]()
$362
This Alaska Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:00 pm -
Nonstop6h 05m
Fri 11/278:00 am -
Nonstop5h 04m
Deal found 9/8![Alaska Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:00 pm -
2 stops10h 55m
Thu 10/226:15 am -
2 stops13h 40m
Deal found 9/6![Southwest logo]()
$393
This Delta deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:10 am -
1 stop7h 16m
Wed 10/76:00 am -
1 stop7h 39m
Deal found 9/4![Delta logo]()
$413
This United Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:15 am -
1 stop9h 05m
Sat 11/148:09 am -
Nonstop4h 59m
Deal found 9/8![United Airlines logo]()
$387
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:46 am -
Nonstop5h 50m
Sun 11/89:49 pm -
Nonstop4h 55m
Deal found 9/7![Alaska Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/104:55 pm -
2 stops9h 35m
Fri 11/1312:15 am -
1 stop7h 10m
Deal found 9/8![Southwest logo]()
$422
This United Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2610:30 am -
1 stop8h 49m
Mon 11/3010:56 pm -
1 stop6h 44m
Deal found 9/7![United Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:10 am -
1 stop7h 30m
Sat 11/1411:47 pm -
1 stop7h 55m
Deal found 9/8![Delta logo]()
$427
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:02 am -
Nonstop5h 44m
Tue 10/279:18 pm -
Nonstop5h 02m
Deal found 9/7![Alaska Airlines logo]()
$397
This Southwest deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/82:30 pm -
2 stops10h 45m
Wed 12/96:30 pm -
1 stop8h 05m
Deal found 9/7![Southwest logo]()
$422
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:45 pm -
Nonstop5h 50m
Thu 10/297:20 am -
Nonstop5h 03m
Deal found 9/8![Delta logo]()
$427
This Alaska Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:15 pm -
Nonstop5h 42m
Mon 10/59:18 pm -
Nonstop5h 02m
Deal found 9/4![Alaska Airlines logo]()
$417
This Southwest deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:20 am -
2 stops14h 30m
Sat 10/316:15 am -
2 stops9h 10m
Deal found 9/4![Southwest logo]()
$427
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:25 pm -
1 stop7h 32m
Thu 11/1211:45 pm -
1 stop8h 10m
Deal found 9/8![Delta logo]()
$437
This Southwest deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:25 am -
1 stop10h 55m
Sun 11/17:55 am -
1 stop10h 35m
Deal found 9/4![Southwest logo]()
$427
This Delta deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:25 pm -
Nonstop6h 02m
Fri 11/207:20 am -
Nonstop4h 53m
Deal found 9/5![Delta logo]()
$442
This Southwest deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:05 am -
1 stop8h 15m
Thu 10/299:00 am -
1 stop9h 35m
Deal found 9/8![Southwest logo]()
$427
Last-minute flights from Washington, D.C. to SeattleDiscover last-minute flight deals from Washington, D.C. to Seattle. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from Washington, D.C. to Seattle. Data last updated September 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:00 am -
1 stop11h 08m
Fri 10/24:27 pm -
1 stop16h 44m
Deal found 9/7![Frontier logo]()
$293
This American Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:58 pm -
1 stop8h 38m
Sun 10/411:57 pm -
1 stop8h 50m
Deal found 9/7![American Airlines logo]()
$282
This Alaska Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:00 am -
Nonstop5h 37m
Wed 10/73:56 pm -
Nonstop5h 03m
Deal found 9/6![Alaska Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:57 pm -
Nonstop5h 47m
Mon 10/59:36 pm -
Nonstop5h 04m
Deal found 9/6![Alaska Airlines logo]()
$288
This United Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:45 pm -
Nonstop5h 52m
Fri 10/911:14 pm -
Nonstop5h 03m
Deal found 9/4![United Airlines logo]()
$295
This American Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:25 am -
1 stop11h 12m
Sat 10/104:37 pm -
1 stop9h 55m
Deal found 9/5![American Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:45 pm -
Nonstop5h 52m
Thu 10/158:25 am -
Nonstop5h 06m
Deal found 9/7![United Airlines logo]()
$282
This Alaska Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:00 pm -
Nonstop5h 55m
Fri 10/161:49 pm -
Nonstop5h 10m
Deal found 9/6![Alaska Airlines logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am -
1 stop30h 42m
Mon 10/129:16 pm -
1 stop30h 04m
Deal found 9/4![Frontier logo]()
$281
This American Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:20 am -
1 stop9h 32m
Sat 10/1011:59 pm -
1 stop8h 00m
Deal found 9/4![American Airlines logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:02 am -
Nonstop5h 42m
Mon 10/199:36 pm -
Nonstop5h 04m
Deal found 9/5![Alaska Airlines logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:00 am -
1 stop11h 12m
Fri 10/234:27 pm -
1 stop16h 37m
Deal found 9/8![Frontier logo]()
$284
One-way flights from Washington, D.C. to SeattleSearch for one-way flight options from Washington, D.C. to Seattle. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
Search for one-way flight options from Washington, D.C. to Seattle. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:22 pm -
2 stops23h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:28 pm -
2 stops47h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$124
This Trip.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:45 am -
2 stops31h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:12 pm -
2 stops21h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:22 am -
2 stops31h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:12 pm -
2 stops45h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/812:32 pm -
2 stops30h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:25 pm -
2 stops23h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:12 pm -
2 stops21h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:28 pm -
2 stops23h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/512:31 pm -
2 stops29h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:50 am -
2 stops28h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$173
Find flight deals from Washington, D.C. to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $281 (Kiwi.com) |
One-way from | $121 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $390 |
Good round-trip deal | $377 or less |
Good one-way deal | $216 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington, D.C. to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 9, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BaltimoreSeattle
BWI Baltimore/Washington - SEA Seattle/Tacoma Intl
BWISEA
Baltimore/Washington
Wed 10/7
6:15 pm-9:00 pm
Nonstop5h 45m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$199
Washington, D.C.Seattle
DCA Washington, D.C. Reagan-National - SEA Seattle/Tacoma Intl
DCASEA
Washington, D.C. Reagan-National
Thu 10/15
6:00 pm-12:40 am
1 stop9h 40m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$199
Washington, D.C.Seattle
IAD Washington, D.C. Dulles Intl - SEA Seattle/Tacoma Intl
IADSEA
Washington, D.C. Dulles Intl
Mon 10/19
7:05 am-9:56 am
Nonstop5h 51m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$209
BaltimoreSeattle
BWI Baltimore/Washington - SEA Seattle/Tacoma Intl
BWISEA
Baltimore/Washington
Sat 12/5
8:25 am-4:05 pm
2 stops10h 40m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$209
Washington, D.C.Seattle
DCA Washington, D.C. Reagan-National - SEA Seattle/Tacoma Intl
DCASEA
Washington, D.C. Reagan-National
Wed 10/7
11:40 am-7:05 pm
2 stops10h 25m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$214
Washington, D.C.Seattle
IAD Washington, D.C. Dulles Intl - SEA Seattle/Tacoma Intl
IADSEA
Washington, D.C. Dulles Intl
Sat 12/5
6:30 am-9:21 pm
2 stops17h 51m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$219
BaltimoreSeattle
BWI Baltimore/Washington - SEA Seattle/Tacoma Intl
BWISEA
Baltimore/Washington
Thu 10/1
12:30 pm-6:45 pm
1 stop9h 15m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$219
BaltimoreSeattle
BWI Baltimore/Washington - SEA Seattle/Tacoma Intl
BWISEA
Baltimore/Washington
Sat 10/3
6:25 am-11:27 am
1 stop8h 02m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$219
BaltimoreSeattle
BWI Baltimore/Washington - SEA Seattle/Tacoma Intl
BWISEA
Baltimore/Washington
Mon 10/19
6:28 pm-11:52 pm
1 stop8h 24m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$219
Washington, D.C.Seattle
DCA Washington, D.C. Reagan-National - SEA Seattle/Tacoma Intl
DCASEA
Washington, D.C. Reagan-National
Sat 11/7
6:25 am-7:17 pm
2 stops15h 52m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$219
Showing 1-10 of 60 resultsSorted by cheapest first
Compare providers for flights from Washington, D.C. to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Seattle in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Washington, D.C.-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Washington, D.C.-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Washington, D.C. to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Washington, D.C. with our price prediction graph.
WAS-SEA
IAD-SEA
DCA-SEA
BWI-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Washington, D.C. to Seattle
WAS-SEA
IAD-SEA
DCA-SEA
BWI-SEA
What is the cheapest month to book a flight from Washington, D.C. to Seattle?
Currently, February is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $281). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $529). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from WAS to SEA?
Find hourly flight availability from Washington, D.C. to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 9, 2026.
It’s typically best to fly out from Washington, D.C. to Seattle in the afternoon. Doing so could potentially save you 20% on the flight price compared to flying at noon, which is usually more expensive.
Weekly flight availability from Washington, D.C. to Seattle
Explore weekly flight availability from Washington, D.C. to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 9, 2026.
The most flights from WAS to SEA are scheduled on a Tuesday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).
How much does it cost to fly round-trip from Washington, D.C. to Seattle?
Airfare is below average for this route at the moment.
Washington, D.C. to Seattle flights typically cost between $306 and $503 in October.The cheapest round-trip price found within the last 5 days was $281 on Frontier (Oct 6-Oct 12).
What’s the top layover airport for flights from Washington, D.C. to Seattle?
Share of 1-stop round-trip flights from Washington, D.C. to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 60% of 1-stop itineraries from Washington, D.C. to Seattle on Cheapflights.
What’s the cheapest layover airport for flights from Washington, D.C. to Seattle?
Average round-trip fare for 1-stop flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of $326.
What’s the fastest layover option from Washington, D.C. to Seattle?
Shortest average travel time for 1-stop one-way flights from Washington, D.C. to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 10m.
Which airport typically offers the quickest layover for flights from Washington, D.C. to Seattle?
Average layover duration for 1-stop one-way flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 13m.
How far ahead should I book a flight from Washington, D.C. to Seattle?
The best time to book flights from Washington, D.C. to Seattle is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from Washington, D.C. to Seattle?
Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Seattle. Price data was last updated on September 5, 2026.
Travelers seeking maximum savings on their Washington, D.C. to Seattle flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Washington, D.C. to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated September 9, 2026.
Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Washington, D.C. to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Crew
8.5
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Related info for your journey
Find useful and relevant information for your journey from Washington, D.C. to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Tukwila
Edmonds
Snoqualmie
Puyallup
Lynnwood
Centralia
Kent
Tumwater
Ellensburg
Issaquah
Marysville
Ocean Shores
Lakewood
Fife
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Washington, D.C. and Seattle flights
Browse other Washington, D.C. and Seattle flight options. Last updated on September 9, 2026.
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Browse through other flights departing from Washington, D.C.. Flights are based on user searches made on Cheapflights and were last updated on September 9, 2026.
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Consider these flights traveling from Washington, D.C. to Seattle.
Top 8 airlines flying from Washington, D.C. to Seattle
Discover the top 8 airlines that operate flights from Washington, D.C. to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$99 | Average$365 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$123 | Average$343 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$138 | Average$332 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$179 | Average$462 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$186 | Average$421 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$199 | Average$420 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$219 | Average$369 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$233 | Average$484 | FlexibilityNo cancel fee | On-time75% |