$140+ Cheap flights from Seattle (SEA) to Delaware
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
May 10 — May 171
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Delaware 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
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Delaware
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Cheapest flights from Seattle to DelawareExplore the most affordable flight options available from Seattle to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 10, 2026.
Explore the most affordable flight options available from Seattle to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Sat 5/24:42 pm
PHL
- SEA
2 stops19h 45m
Frontier
Deal found 4/6![Frontier logo]()
$288
This Expedia deal was found by Cheapflights users on 4/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:12 pm
SEA
- PHL
1 stop7h 22m
Multiple Airlines
Mon 4/276:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:57 am
SEA
- PHL
2 stops15h 37m
Frontier
Thu 5/78:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/6![Frontier logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 5/67:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Wed 5/138:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/8![Frontier logo]()
$293
This Expedia deal was found by Cheapflights users on 4/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:20 pm
SEA
- PHL
1 stop10h 14m
Multiple Airlines
Mon 5/46:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$294
This Orbitz deal was found by Cheapflights users on 4/7. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/223:19 pm
SEA
- PHL
1 stop11h 18m
Multiple Airlines
Sun 5/247:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$295
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Thu 4/234:20 pm
SEA
- PHL
2 stops29h 34m
Frontier
Thu 4/308:41 pm
PHL
- SEA
1 stop16h 11m
Frontier
Deal found 4/8![Frontier logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 5/117:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Mon 5/188:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/7![Frontier logo]()
$298
This Trip.com deal was found by Cheapflights users on 4/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Sun 4/198:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Deal found 4/7![Frontier logo]()
$299
This CheapOair deal was found by Cheapflights users on 4/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:13 pm
SEA
- PHL
1 stop31h 07m
Frontier
Sat 7/2512:42 pm
PHL
- SEA
1 stop24h 06m
Frontier
Deal found 4/6![Frontier logo]()
$301
This Mytrip deal was found by Cheapflights users on 4/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Sat 5/308:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 4/8![Frontier logo]()
$302
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/87:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Thu 5/148:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/9![Frontier logo]()
$303
Best flights from Seattle to DelawareDiscover carefully curated flight deals from Seattle to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 10, 2026.
Discover carefully curated flight deals from Seattle to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 10, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/5. 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.
Thu 9/38:45 am
SEA
- PHL
Nonstop5h 19m
Alaska Airlines
Mon 9/77:00 am
PHL
- SEA
Nonstop5h 53m
Alaska Airlines
Deal found 4/5![Alaska Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 4/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/79:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Wed 5/137:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 4/6![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 4/5. 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 9/169:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Mon 9/217:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 4/5![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 4/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:20 am
SEA
- SBY
1 stop11h 40m
American Airlines
Wed 11/256:30 am
SBY
- SEA
1 stop18h 45m
American Airlines
Deal found 4/8![American Airlines logo]()
$686
This Delta deal was found by Cheapflights users on 4/9. 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.
Fri 6/57:59 pm
SEA
- PHL
1 stop7h 11m
Delta
Sun 6/77:00 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 4/9![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 4/9. 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 5/117:59 pm
SEA
- PHL
1 stop7h 11m
Delta
Wed 5/137:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 4/9![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 4/9. 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 6/69:20 pm
SEA
- PHL
Nonstop5h 15m
Delta
Mon 6/157:23 am
PHL
- SEA
1 stop10h 16m
Delta
Deal found 4/9![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 4/9. 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 5/139:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Wed 5/205:18 pm
PHL
- SEA
1 stop8h 30m
Delta
Deal found 4/9![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 4/5. 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.
Fri 5/229:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Mon 5/256:12 am
PHL
- SEA
1 stop7h 53m
Delta
Deal found 4/5![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 4/9. 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 6/149:31 pm
SEA
- PHL
Nonstop5h 14m
Delta
Sun 6/217:03 pm
PHL
- SEA
1 stop7h 56m
Delta
Deal found 4/9![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 4/4. 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 7/169:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Fri 7/246:57 pm
PHL
- SEA
1 stop8h 01m
Delta
Deal found 4/4![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 4/7. 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 5/127:15 am
SEA
- PHL
1 stop7h 12m
Delta
Thu 5/145:18 pm
PHL
- SEA
1 stop8h 30m
Delta
Deal found 4/7![Delta logo]()
$369
This American Airlines deal was found by Cheapflights users on 4/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
SEA
- SBY
1 stop8h 59m
American Airlines
Wed 4/296:38 am
SBY
- SEA
1 stop7h 56m
American Airlines
Deal found 4/6![American Airlines logo]()
$882
This American Airlines deal was found by Cheapflights users on 4/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:34 pm
SEA
- SBY
1 stop7h 20m
American Airlines
Tue 4/286:38 am
SBY
- SEA
1 stop7h 56m
American Airlines
Deal found 4/6![American Airlines logo]()
$882
This American Airlines deal was found by Cheapflights users on 4/9. 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 4/2312:34 pm
SEA
- SBY
1 stop7h 20m
American Airlines
Tue 4/286:00 am
SBY
- SEA
1 stop8h 28m
American Airlines
Deal found 4/9![American Airlines logo]()
$937
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated April 10, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated April 10, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Sun 4/198:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Deal found 4/7![Frontier logo]()
$299
This American Airlines deal was found by Cheapflights users on 4/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
SEA
- SBY
1 stop8h 59m
American Airlines
Wed 4/296:38 am
SBY
- SEA
1 stop7h 56m
American Airlines
Deal found 4/6![American Airlines logo]()
$882
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Thu 4/234:20 pm
SEA
- PHL
2 stops29h 34m
Frontier
Thu 4/308:41 pm
PHL
- SEA
1 stop16h 11m
Frontier
Deal found 4/8![Frontier logo]()
$297
This Expedia deal was found by Cheapflights users on 4/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:12 pm
SEA
- PHL
1 stop7h 22m
Multiple Airlines
Mon 4/276:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:57 am
SEA
- PHL
2 stops15h 37m
Frontier
Thu 5/78:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/6![Frontier logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Sat 5/24:42 pm
PHL
- SEA
2 stops19h 45m
Frontier
Deal found 4/6![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 5/67:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Wed 5/138:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/8![Frontier logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/87:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Thu 5/148:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/9![Frontier logo]()
$303
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 5/117:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Mon 5/188:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/7![Frontier logo]()
$298
This Orbitz deal was found by Cheapflights users on 4/7. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/223:19 pm
SEA
- PHL
1 stop11h 18m
Multiple Airlines
Sun 5/247:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$295
This Mytrip deal was found by Cheapflights users on 4/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Sat 5/308:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 4/8![Frontier logo]()
$302
This CheapOair deal was found by Cheapflights users on 4/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Sun 5/318:35 pm
PHL
- SEA
1 stop20h 26m
Frontier
Deal found 4/6![Frontier logo]()
$301
One-way flights from Seattle to DelawareSearch for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated April 10, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated April 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/77:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Deal found 4/6![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/10. 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.
Sun 5/107:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Deal found 4/10![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:12 pm
SEA
- PHL
2 stops49h 27m
Frontier
Deal found 4/6![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 4/5. 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 5/57:50 pm
SEA
- PHL
3 stops24h 55m
Multiple Airlines
Deal found 4/5![Multiple Airlines logo]()
$144
This Expedia deal was found by Cheapflights users on 4/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:52 pm
SEA
- PHL
1 stop7h 45m
Frontier
Deal found 4/6![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Sun 4/269:54 pm
SEA
- PHL
2 stops52h 40m
Frontier
Deal found 4/7![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/67:50 pm
SEA
- PHL
2 stops50h 16m
Frontier
Deal found 4/6![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 6/98:12 pm
SEA
- PHL
3 stops25h 09m
Multiple Airlines
Deal found 4/9![Multiple Airlines logo]()
$149
This WAYA deal was found by Cheapflights users on 4/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 pm
SEA
- PHL
1 stop8h 37m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$150
This Expedia deal was found by Cheapflights users on 4/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
Deal found 4/6![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:13 pm
SEA
- SBY
2 stops44h 18m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$313
This American Airlines deal was found by Cheapflights users on 4/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:20 am
SEA
- SBY
1 stop11h 38m
American Airlines
Deal found 4/6![American Airlines logo]()
$610
Find flight deals from Seattle to Delaware
Keep the following information in mind while searching for Seattle to Delaware flight deals. Data was last updated April 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $288 (Kiwi.com) |
One-way from | $140 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $412 |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Delaware 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 2,558,603 searches. Data last updated April 10, 2026.
Use the filters below to find and compare flights from Seattle to Delaware that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 9/3
8:45 am-5:04 pm
Nonstop5h 19m
Philadelphia
Mon 9/7
7:00 am-9:53 am
Nonstop5h 53m
$329
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/7
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Wed 5/13
7:10 am-10:00 am
Nonstop5h 50m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 9/16
9:50 pm-6:05 am
Nonstop5h 15m
Philadelphia
Mon 9/21
7:05 am-10:04 am
Nonstop5h 59m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 6/5
7:59 pm-6:10 am
1 stop7h 11m
Philadelphia
Sun 6/7
7:00 am-9:59 am
Nonstop5h 59m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 5/11
7:59 pm-6:10 am
1 stop7h 11m
Philadelphia
Wed 5/13
7:10 am-10:00 am
Nonstop5h 50m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 6/6
9:20 pm-5:35 am
Nonstop5h 15m
Philadelphia
Mon 6/15
7:23 am-2:39 pm
1 stop10h 16m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 5/13
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Wed 5/20
5:18 pm-10:48 pm
1 stop8h 30m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 5/22
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Mon 5/25
6:12 am-11:05 am
1 stop7h 53m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sun 6/14
9:31 pm-5:45 am
Nonstop5h 14m
Philadelphia
Sun 6/21
7:03 pm-11:59 pm
1 stop7h 56m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 7/16
9:30 pm-5:53 am
Nonstop5h 23m
Philadelphia
Fri 7/24
6:57 pm-11:58 pm
1 stop8h 01m
$363
Showing 1-10 of 30 resultsSorted by cheapest first
Best time to book a flight from Seattle to Delaware
Have a flexible travel schedule? Discover the best time to fly to Delaware from Seattle with our price prediction graph.
SEA-PHL
SEA-SBY
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 Seattle to Delaware
SEA-USDE
SEA-PHL
SEA-SBY
No data available for this route at this time. Please check back soon.
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