$104+ Cheap flights from Illinois to Washington
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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Sep 8 — Sep 151
Round-trip
1 adult, Economy
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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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Cheapest flights from Illinois to WashingtonExplore the most affordable flight options available from Illinois to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 9, 2026.
Explore the most affordable flight options available from Illinois to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 9, 2026.
This CheapOair deal was found by Cheapflights users on 8/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:17 pm -
1 stop25h 19m
Fri 9/1112:38 pm -
1 stop28h 39m
Deal found 8/7![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 8/7. 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.
Wed 9/912:17 pm -
1 stop25h 19m
Mon 9/1412:39 pm -
1 stop20h 53m
Deal found 8/7![Frontier logo]()
$253
This Frontier deal was found by Cheapflights users on 8/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:45 pm -
1 stop24h 36m
Thu 8/2712:20 pm -
1 stop28h 53m
Deal found 8/7![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:45 pm -
1 stop24h 36m
Mon 8/246:17 pm -
1 stop21h 33m
Deal found 8/5![Frontier logo]()
$278
This United Airlines deal was found by Cheapflights users on 8/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/163:35 pm -
1 stop9h 10m
Tue 9/221:57 pm -
1 stop7h 16m
Deal found 8/5![United Airlines logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/226:30 am -
1 stop10h 38m
Fri 10/210:53 am -
2 stops16h 45m
Deal found 8/9![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/226:30 am -
1 stop10h 38m
Thu 10/14:27 pm -
1 stop29h 56m
Deal found 8/9![Frontier logo]()
$283
This CheapOair deal was found by Cheapflights users on 8/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:55 pm -
1 stop14h 47m
Tue 9/1510:57 am -
1 stop16h 41m
Deal found 8/7![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/7. 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.
Thu 9/108:55 pm -
1 stop14h 47m
Wed 9/169:45 pm -
1 stop29h 53m
Deal found 8/7![Frontier logo]()
$285
This Booking.com deal was found by Cheapflights users on 8/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:41 pm -
1 stop20h 38m
Sun 9/610:34 am -
1 stop17h 25m
Deal found 8/6![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Thu 8/272:41 pm -
1 stop20h 38m
Mon 8/317:06 pm -
1 stop16h 30m
Deal found 8/5![Frontier logo]()
$287
This CheapOair deal was found by Cheapflights users on 8/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/289:20 pm -
1 stop22h 31m
Sat 9/57:06 pm -
1 stop16h 30m
Deal found 8/4![Frontier logo]()
$288
Best flights from Illinois to WashingtonDiscover carefully curated flight deals from Illinois to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 9, 2026.
Discover carefully curated flight deals from Illinois to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 9, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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.
Sat 10/312:21 pm -
1 stop9h 19m
Wed 11/184:37 pm -
1 stop11h 03m
Deal found 8/6![Alaska Airlines logo]()
$311
This Delta deal was found by Cheapflights users on 8/9. 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 9/54:45 pm -
1 stop7h 46m
Fri 9/111:00 pm -
1 stop8h 57m
Deal found 8/9![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 8/8. 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.
Wed 9/305:10 am -
2 stops9h 13m
Mon 10/511:59 pm -
1 stop8h 11m
Deal found 8/8![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 8/4. 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.
Fri 10/165:50 pm -
2 stops8h 45m
Mon 10/192:10 pm -
2 stops8h 25m
Deal found 8/4![Southwest logo]()
$342
This American Airlines deal was found by Cheapflights users on 8/8. 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.
Mon 8/244:32 pm -
1 stop7h 54m
Sun 8/303:35 pm -
1 stop6h 33m
Deal found 8/8![American Airlines logo]()
$394
This Alaska Airlines deal was found by Cheapflights users on 8/8. 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.
Sat 9/126:08 pm -
Nonstop4h 12m
Sat 9/1911:16 am -
Nonstop3h 54m
Deal found 8/8![Alaska Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 8/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:00 am -
2 stops14h 37m
Wed 10/147:00 am -
1 stop6h 21m
Deal found 8/9![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 8/8. 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.
Fri 9/48:50 pm -
Nonstop3h 55m
Sun 9/67:55 am -
1 stop7h 30m
Deal found 8/8![Southwest logo]()
$347
This Expedia deal was found by Cheapflights users on 8/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:54 pm -
1 stop7h 05m
Wed 9/91:36 pm -
1 stop8h 23m
Deal found 8/9![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 8/5. 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.
Mon 9/142:25 pm -
1 stop5h 51m
Fri 9/183:00 pm -
1 stop6h 16m
Deal found 8/5![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 8/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:15 am -
1 stop9h 53m
Tue 9/226:32 am -
2 stops13h 28m
Deal found 8/5![United Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 8/6. 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.
Sat 10/316:04 am -
1 stop7h 46m
Wed 11/187:00 am -
1 stop7h 39m
Deal found 8/6![Delta logo]()
$351
This Southwest deal was found by Cheapflights users on 8/7. 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 9/22:10 pm -
1 stop9h 55m
Wed 9/161:55 pm -
1 stop7h 00m
Deal found 8/7![Southwest logo]()
$351
This United Airlines deal was found by Cheapflights users on 8/7. 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 9/238:00 am -
2 stops13h 08m
Sat 9/2611:59 pm -
1 stop8h 11m
Deal found 8/7![United Airlines logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
Fri 10/167:20 am -
1 stop8h 57m
Fri 10/165:49 pm -
Nonstop4h 10m
Deal found 8/7![Alaska Airlines logo]()
$342
This Delta deal was found by Cheapflights users on 8/4. 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 9/172:50 pm -
1 stop10h 58m
Sat 9/199:23 am -
1 stop6h 37m
Deal found 8/4![Delta logo]()
$351
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:50 pm -
Nonstop3h 55m
Mon 9/146:55 am -
2 stops8h 15m
Deal found 8/9![Southwest logo]()
$352
This KAYAK deal was found by Cheapflights users on 8/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:10 pm -
1 stop8h 49m
Thu 8/275:59 am -
Nonstop4h 13m
Deal found 8/6![American Airlines logo]()
$448
This United Airlines deal was found by Cheapflights users on 8/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:00 am -
2 stops13h 08m
Tue 10/136:30 am -
2 stops10h 13m
Deal found 8/9![United Airlines logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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.
Sun 9/136:00 am -
1 stop8h 39m
Sat 9/1912:17 pm -
1 stop9h 42m
Deal found 8/6![Alaska Airlines logo]()
$348
This Southwest deal was found by Cheapflights users on 8/6. 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.
Mon 10/55:15 am -
2 stops10h 50m
Wed 10/76:05 am -
1 stop9h 10m
Deal found 8/6![Southwest logo]()
$356
This Delta deal was found by Cheapflights users on 8/4. 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.
Tue 9/157:45 am -
2 stops9h 29m
Sat 9/197:05 am -
1 stop8h 55m
Deal found 8/4![Delta logo]()
$356
This Southwest deal was found by Cheapflights users on 8/7. 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.
Thu 10/225:15 am -
2 stops10h 50m
Sat 10/246:05 am -
1 stop6h 30m
Deal found 8/7![Southwest logo]()
$356
This Delta deal was found by Cheapflights users on 8/5. 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 10/316:30 am -
2 stops11h 45m
Wed 11/181:13 pm -
1 stop8h 46m
Deal found 8/5![Delta logo]()
$356
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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.
Tue 9/226:29 am -
Nonstop4h 27m
Tue 10/136:03 pm -
Nonstop3h 56m
Deal found 8/6![Alaska Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 8/7. 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 10/157:00 am -
Nonstop4h 36m
Wed 10/2111:13 pm -
Nonstop4h 06m
Deal found 8/7![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 8/7. 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.
Wed 10/77:00 am -
1 stop7h 18m
Wed 10/147:25 pm -
2 stops10h 16m
Deal found 8/7![Delta logo]()
$356
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:00 pm -
Nonstop4h 20m
Sun 10/411:35 pm -
Nonstop3h 50m
Deal found 8/9![Southwest logo]()
$357
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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 9/66:08 pm -
Nonstop4h 12m
Sat 9/1211:16 am -
Nonstop3h 54m
Deal found 8/7![Alaska Airlines logo]()
$362
This United Airlines deal was found by Cheapflights users on 8/7. 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 9/304:05 pm -
Nonstop4h 47m
Mon 10/57:00 am -
Nonstop4h 15m
Deal found 8/7![United Airlines logo]()
$377
Last-minute flights from Illinois to WashingtonDiscover last-minute flight deals from Illinois to Washington. Data last updated August 9, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Washington. Data last updated August 9, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:45 pm -
1 stop24h 36m
Mon 8/246:17 pm -
1 stop21h 33m
Deal found 8/5![Frontier logo]()
$278
This Frontier deal was found by Cheapflights users on 8/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:45 pm -
1 stop24h 36m
Thu 8/2712:20 pm -
1 stop28h 53m
Deal found 8/7![Frontier logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Thu 8/272:41 pm -
1 stop20h 38m
Mon 8/317:06 pm -
1 stop16h 30m
Deal found 8/5![Frontier logo]()
$287
This Booking.com deal was found by Cheapflights users on 8/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:41 pm -
1 stop20h 38m
Sun 9/610:34 am -
1 stop17h 25m
Deal found 8/6![Frontier logo]()
$286
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:50 pm -
Nonstop3h 55m
Wed 9/94:55 pm -
1 stop10h 05m
Deal found 8/9![Southwest logo]()
$258
This CheapOair deal was found by Cheapflights users on 8/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:17 pm -
1 stop25h 19m
Fri 9/1112:38 pm -
1 stop28h 39m
Deal found 8/7![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 8/7. 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.
Wed 9/912:17 pm -
1 stop25h 19m
Mon 9/1412:39 pm -
1 stop20h 53m
Deal found 8/7![Frontier logo]()
$253
This Kiwi.com deal was found by Cheapflights users on 8/7. 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.
Thu 9/108:55 pm -
1 stop14h 47m
Wed 9/169:45 pm -
1 stop29h 53m
Deal found 8/7![Frontier logo]()
$285
This CheapOair deal was found by Cheapflights users on 8/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:55 pm -
1 stop14h 47m
Tue 9/1510:57 am -
1 stop16h 41m
Deal found 8/7![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/226:30 am -
1 stop10h 38m
Fri 10/210:53 am -
2 stops16h 45m
Deal found 8/9![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/226:30 am -
1 stop10h 38m
Thu 10/14:27 pm -
1 stop29h 56m
Deal found 8/9![Frontier logo]()
$283
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:50 pm -
1 stop8h 40m
Tue 10/61:55 pm -
1 stop7h 15m
Deal found 8/9![Southwest logo]()
$239
One-way flights from Illinois to WashingtonSearch for one-way flight options from Illinois to Washington. Find affordable one-way fares based on user searches. Data last updated August 9, 2026.
Search for one-way flight options from Illinois to Washington. Find affordable one-way fares based on user searches. Data last updated August 9, 2026.
This Southwest deal was found by Cheapflights users on 8/8. 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 11/75:50 am -
1 stop7h 00m
Deal found 8/8![Southwest logo]()
$104
This Southwest deal was found by Cheapflights users on 8/7. 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 10/62:35 pm -
1 stop6h 30m
Deal found 8/7![Southwest logo]()
$109
This Delta deal was found by Cheapflights users on 8/6. 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.
Sun 9/68:00 am -
1 stop8h 50m
Deal found 8/6![Delta logo]()
$114
This Southwest deal was found by Cheapflights users on 8/6. 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.
Mon 10/55:50 pm -
2 stops8h 45m
Deal found 8/6![Southwest logo]()
$119
This Trip.com deal was found by Cheapflights users on 8/8. 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.
Wed 10/148:10 pm -
1 stop22h 25m
Deal found 8/8![Frontier logo]()
$120
This Southwest deal was found by Cheapflights users on 8/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:20 pm -
1 stop7h 40m
Deal found 8/9![Southwest logo]()
$120
This Trip.com deal was found by Cheapflights users on 8/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/317:58 pm -
1 stop23h 13m
Deal found 8/5![Frontier logo]()
$123
This Trip.com deal was found by Cheapflights users on 8/8. 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.
Wed 9/26:45 pm -
1 stop20h 07m
Deal found 8/8![Frontier logo]()
$125
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:45 pm -
1 stop20h 07m
Deal found 8/5![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Thu 8/277:58 pm -
1 stop15h 21m
Deal found 8/5![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 11/168:10 pm -
2 stops48h 16m
Deal found 8/5![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 10/78:10 pm -
1 stop15h 41m
Deal found 8/7![Frontier logo]()
$137
Find flight deals from Illinois to Washington
Keep the following information in mind while searching for Illinois to Washington flight deals. Data was last updated August 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $230 (Southwest) |
One-way from | $104 (Southwest) |
Popular in | June |
Cheapest in | January |
Average price | $375 |
Good round-trip deal | $303 or less |
Good one-way deal | $211 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Washington 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 August 9, 2026.
Use the filters below to find and compare flights from Illinois to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Sat 10/31
2:21 pm-9:40 pm
1 stop9h 19m
Spokane
Wed 11/18
4:37 pm-5:40 am
1 stop11h 03m
$311
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Sat 9/5
4:45 pm-10:31 pm
1 stop7h 46m
Spokane
Fri 9/11
1:00 pm-11:57 pm
1 stop8h 57m
$317
Quickest round-trip
St. LouisPortland
STL Lambert-St Louis - PDX Portland
STLPDX
Lambert-St Louis
Sat 9/12
6:08 pm-8:20 pm
Nonstop4h 12m
Portland
Sat 9/19
11:16 am-5:10 pm
Nonstop3h 54m
$317
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Sat 9/5
6:54 pm-11:59 pm
1 stop7h 05m
Spokane
Wed 9/9
1:36 pm-11:59 pm
1 stop8h 23m
$317
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Wed 9/30
5:10 am-12:23 pm
2 stops9h 13m
Seattle/Tacoma Intl
Mon 10/5
11:59 pm-10:10 am
1 stop8h 11m
$332
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Sat 10/10
8:00 am-8:37 pm
2 stops14h 37m
Seattle/Tacoma Intl
Wed 10/14
7:00 am-3:21 pm
1 stop6h 21m
$332
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Tue 9/15
11:15 am-7:08 pm
1 stop9h 53m
Seattle/Tacoma Intl
Tue 9/22
6:32 am-10:00 pm
2 stops13h 28m
$332
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Wed 9/23
8:00 am-7:08 pm
2 stops13h 08m
Seattle/Tacoma Intl
Sat 9/26
11:59 pm-10:10 am
1 stop8h 11m
$332
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Tue 9/22
8:00 am-7:08 pm
2 stops13h 08m
Seattle/Tacoma Intl
Tue 10/13
6:30 am-6:43 pm
2 stops10h 13m
$337
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Fri 10/16
5:50 pm-12:35 am
2 stops8h 45m
Seattle/Tacoma Intl
Mon 10/19
2:10 pm-12:35 am
2 stops8h 25m
$342
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Illinois with our price prediction graph.
STL-SEA
ORD-GEG
ORD-SEA
MLI-SEA
STL-PDX
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 Illinois to Washington
USIL-USWA
STL-SEA
ORD-GEG
ORD-SEA
MLI-SEA
What is the cheapest month to book a flight from Illinois to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $253). Flying from Illinois to State of Washington in July is currently the most expensive (average of $417). 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 IL to WA?
Find hourly flight availability from Illinois to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 9, 2026.
It’s typically best to fly out from Illinois to State of Washington in the evening. Doing so could potentially save you 15% on the flight price compared to flying in the afternoon, which is usually more expensive.
Weekly flight availability from Illinois to State of Washington
Explore weekly flight availability from Illinois to Washington. 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 August 9, 2026.
The most flights from USIL to USWA are scheduled on a Saturday (55 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from Illinois to State of Washington?
Airfare is below average for this route at the moment.
Illinois to State of Washington flights typically cost between $296 and $443 in September.The cheapest round-trip price found within the last 5 days was $282 on Frontier (Sep 22-Oct 2).
How far ahead should I book a flight from Illinois to State of Washington?
The price you pay for your flight from Illinois to State of Washington may vary depending on when you book. For the best chance of a lower fare, look to book 34 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Illinois to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Washington. Price data was last updated on July 18, 2026.
Travelers seeking maximum savings on their Illinois to State of Washington flight should consider departing on Sunday mornings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated August 9, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta from Illinois to Washington have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Related info for your journey
Find useful and relevant information for your journey from Illinois to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Illinois to Washington
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Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Washington by cabin class
Find flights from Illinois to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Washington flights
Browse other Illinois and Washington flight options. Last updated on August 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Washington
Find the right flight back to Illinois after your stay in Washington
Illinois to Washington flights
Consider these flights traveling from Illinois to Washington.
Top 7 airlines flying from Illinois to Washington
Discover the top 7 airlines that operate flights from Illinois to Washington. 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 2,558,603 searches. Data last updated August 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$308 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$131 | Average$265 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$421 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$177 | Average$415 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$178 | Average$470 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$181 | Average$542 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$227 | Average$373 | FlexibilityNo cancel fee | On-time63% |