$145+ Cheap flights from Illinois to Washington
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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Oct 23 — Oct 301
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Washington 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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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 September 23, 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 September 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/276:30 am -
2 stops30h 29m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/18![Frontier logo]()
$271
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop10h 42m
Fri 10/238:00 pm -
1 stop8h 34m
Deal found 9/19![Frontier logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/286:30 am -
1 stop10h 42m
Fri 11/68:09 pm -
2 stops26h 12m
Deal found 9/18![Frontier logo]()
$274
This Kissandfly.com deal was found by Cheapflights users on 9/19. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:16 pm -
Nonstop4h 36m
Sat 10/1711:41 pm -
Nonstop3h 59m
Deal found 9/19![Alaska Airlines logo]()
$275
This Cheapflightsfares deal was found by Cheapflights users on 9/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:01 pm -
1 stop24h 44m
Thu 10/159:16 pm -
1 stop30h 00m
Deal found 9/22![Frontier logo]()
$276
This Expedia deal was found by Cheapflights users on 9/19. 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 10/213:49 pm -
Nonstop4h 39m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/19![Multiple Airlines logo]()
$278
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:30 am -
1 stop10h 42m
Wed 11/114:27 pm -
1 stop5h 54m
Deal found 9/19![Frontier logo]()
$279
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/15:15 pm -
1 stop18h 30m
Thu 11/59:13 pm -
1 stop30h 00m
Deal found 9/19![Frontier logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/306:00 am -
Nonstop4h 37m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/18![Multiple Airlines logo]()
$281
This Expedia deal was found by Cheapflights users on 9/19. 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 10/206:30 am -
1 stop10h 42m
Sat 10/2411:41 pm -
Nonstop3h 59m
Deal found 9/19![Multiple Airlines logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 10/316:30 am -
1 stop10h 42m
Tue 11/38:09 pm -
2 stops26h 12m
Deal found 9/22![Frontier logo]()
$284
This American Airlines deal was found by Cheapflights users on 9/21. 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 10/244:42 pm -
1 stop9h 28m
Tue 10/276:12 am -
1 stop8h 47m
Deal found 9/21![American Airlines 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 September 23, 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 September 23, 2026.
This United Airlines deal was found by Cheapflights users on 9/21. 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 10/2410:43 am -
1 stop7h 09m
Tue 10/279:05 am -
2 stops12h 08m
Deal found 9/21![United Airlines logo]()
$306
This Southwest deal was found by Cheapflights users on 9/21. 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 10/1510:05 pm -
Nonstop4h 35m
Tue 10/2012:10 am -
Nonstop3h 55m
Deal found 9/21![Southwest logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 9/21. 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 10/157:16 pm -
Nonstop4h 43m
Tue 10/2010:33 am -
Nonstop4h 17m
Deal found 9/21![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 9/21. 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 10/215:30 pm -
Nonstop4h 46m
Fri 10/237:15 am -
Nonstop4h 15m
Deal found 9/21![Delta logo]()
$338
This American Airlines deal was found by Cheapflights users on 9/20. 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 10/242:30 pm -
1 stop7h 44m
Mon 10/263:14 pm -
1 stop6h 45m
Deal found 9/20![American Airlines logo]()
$376
This Alaska Airlines deal was found by Cheapflights users on 9/22. 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 11/102:15 pm -
1 stop9h 30m
Wed 11/1112:41 pm -
1 stop9h 18m
Deal found 9/22![Alaska Airlines logo]()
$323
This Southwest deal was found by Cheapflights users on 9/19. 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 10/177:05 pm -
Nonstop4h 35m
Sat 10/2412:40 pm -
1 stop6h 20m
Deal found 9/19![Southwest logo]()
$327
This United Airlines deal was found by Cheapflights users on 9/22. 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 11/28:20 pm -
Nonstop4h 47m
Tue 11/35:05 am -
1 stop6h 24m
Deal found 9/22![United Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/19. 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 12/2110:30 pm -
Nonstop4h 45m
Thu 12/241:50 pm -
1 stop6h 45m
Deal found 9/19![Southwest logo]()
$327
This United Airlines deal was found by Cheapflights users on 9/18. 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 10/178:12 pm -
Nonstop4h 44m
Mon 10/197:25 pm -
1 stop7h 36m
Deal found 9/18![United Airlines logo]()
$327
This Alaska Airlines deal was found by Cheapflights users on 9/22. 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 10/155:46 pm -
Nonstop4h 42m
Mon 10/199:08 pm -
1 stop14h 17m
Deal found 9/22![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 9/18. 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 11/181:08 pm -
1 stop7h 46m
Deal found 9/18![Delta logo]()
$363
This American Airlines deal was found by Cheapflights users on 9/20. 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 10/225:00 am -
1 stop6h 31m
Mon 10/263:14 pm -
1 stop6h 45m
Deal found 9/20![American Airlines logo]()
$379
This Alaska Airlines deal was found by Cheapflights users on 9/19. 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 11/47:20 am -
1 stop9h 25m
Mon 11/95:51 pm -
Nonstop4h 08m
Deal found 9/19![Alaska Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 9/19. 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 12/217:42 pm -
Nonstop4h 50m
Thu 12/242:41 pm -
1 stop7h 49m
Deal found 9/19![United Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 9/19. 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 1/97:30 am -
1 stop6h 35m
Sat 1/165:45 am -
2 stops9h 04m
Deal found 9/19![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 9/18. 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 11/610:00 pm -
Nonstop4h 45m
Mon 11/912:15 am -
Nonstop3h 50m
Deal found 9/18![Southwest logo]()
$338
This Alaska Airlines deal was found by Cheapflights users on 9/18. 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 12/176:57 pm -
Nonstop4h 59m
Sat 1/1610:05 am -
1 stop10h 03m
Deal found 9/18![Alaska Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 9/22. 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 12/57:00 am -
1 stop8h 49m
Sat 12/124:04 pm -
1 stop5h 55m
Deal found 9/22![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 9/18. 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 10/317:35 am -
2 stops9h 15m
Wed 11/1811:00 am -
2 stops8h 47m
Deal found 9/18![Delta logo]()
$374
This Southwest deal was found by Cheapflights users on 9/20. 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 10/3112:50 pm -
2 stops7h 40m
Thu 11/53:45 pm -
1 stop7h 25m
Deal found 9/20![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 9/21. 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 10/292:21 pm -
1 stop11h 16m
Mon 11/211:42 pm -
Nonstop3h 58m
Deal found 9/21![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 9/23. 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 10/306:04 am -
1 stop7h 46m
Tue 11/31:00 pm -
1 stop7h 33m
Deal found 9/23![Delta logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 9/21. 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 11/116:35 pm -
Nonstop4h 54m
Mon 11/168:48 pm -
1 stop14h 29m
Deal found 9/21![Alaska Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/22. 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 11/25:20 pm -
2 stops7h 40m
Tue 11/38:15 pm -
1 stop7h 40m
Deal found 9/22![Southwest logo]()
$363
This American Airlines deal was found by Cheapflights users on 9/22. 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 11/116:50 pm -
1 stop7h 45m
Sun 11/155:10 am -
1 stop6h 52m
Deal found 9/22![American Airlines logo]()
$494
This Delta deal was found by Cheapflights users on 9/18. 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 10/286:06 am -
2 stops14h 29m
Sat 10/3111:45 am -
1 stop8h 51m
Deal found 9/18![Delta logo]()
$378
This United Airlines deal was found by Cheapflights users on 9/20. 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 10/202:28 pm -
2 stops10h 58m
Tue 10/272:30 pm -
1 stop6h 29m
Deal found 9/20![United Airlines logo]()
$384
This Alaska Airlines deal was found by Cheapflights users on 9/22. 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 11/57:00 am -
Nonstop4h 50m
Mon 11/97:13 am -
1 stop9h 46m
Deal found 9/22![Alaska Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/18. 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 11/191:20 pm -
2 stops11h 00m
Fri 12/49:25 am -
1 stop8h 10m
Deal found 9/18![Southwest logo]()
$363
Last-minute flights from Illinois to WashingtonDiscover last-minute flight deals from Illinois to Washington. Data last updated September 23, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Washington. Data last updated September 23, 2026 and is based on user searches.
This Kissandfly.com deal was found by Cheapflights users on 9/19. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:16 pm -
Nonstop4h 36m
Sat 10/1711:41 pm -
Nonstop3h 59m
Deal found 9/19![Alaska Airlines logo]()
$275
This Cheapflightsfares deal was found by Cheapflights users on 9/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:01 pm -
1 stop24h 44m
Thu 10/159:16 pm -
1 stop30h 00m
Deal found 9/22![Frontier logo]()
$276
This Expedia deal was found by Cheapflights users on 9/19. 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 10/206:30 am -
1 stop10h 42m
Sat 10/2411:41 pm -
Nonstop3h 59m
Deal found 9/19![Multiple Airlines logo]()
$283
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop10h 42m
Fri 10/238:00 pm -
1 stop8h 34m
Deal found 9/19![Frontier logo]()
$273
This Expedia deal was found by Cheapflights users on 9/19. 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 10/213:49 pm -
Nonstop4h 39m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/19![Multiple Airlines logo]()
$278
This Cheapflightsfares deal was found by Cheapflights users on 9/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop10h 42m
Wed 10/284:27 pm -
1 stop5h 54m
Deal found 9/21![Frontier logo]()
$279
This American Airlines deal was found by Cheapflights users on 9/21. 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 10/244:42 pm -
1 stop9h 28m
Tue 10/276:12 am -
1 stop8h 47m
Deal found 9/21![American Airlines logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/276:30 am -
2 stops30h 29m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/18![Frontier logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/286:30 am -
1 stop10h 42m
Fri 11/68:09 pm -
2 stops26h 12m
Deal found 9/18![Frontier logo]()
$274
This Frontier deal was found by Cheapflights users on 9/18. 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.
Fri 10/306:30 am -
1 stop10h 42m
Wed 11/44:27 pm -
1 stop5h 54m
Deal found 9/18![Frontier logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/306:00 am -
Nonstop4h 37m
Sat 10/314:27 pm -
1 stop5h 54m
Deal found 9/18![Multiple Airlines logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 10/316:30 am -
1 stop10h 42m
Tue 11/38:09 pm -
2 stops26h 12m
Deal found 9/22![Frontier logo]()
$284
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 September 23, 2026.
Search for one-way flight options from Illinois to Washington. Find affordable one-way fares based on user searches. Data last updated September 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 11/176:30 am -
2 stops14h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$145
This Frontier deal was found by Cheapflights users on 9/18. 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.
Fri 10/306:30 am -
1 stop10h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$146
This Super.com deal was found by Cheapflights users on 9/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:30 am -
1 stop10h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$147
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:30 am -
1 stop10h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$148
This Mytrip deal was found by Cheapflights users on 9/21. 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.
Mon 11/165:15 pm -
2 stops27h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$149
This Gotogate deal was found by Cheapflights users on 9/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/173:49 pm -
Nonstop4h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Alaska Airlines logo]()
$151
This Mytrip deal was found by Cheapflights users on 9/18. 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.
Sun 10/186:00 am -
Nonstop4h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Alaska Airlines logo]()
$152
This Mytrip deal was found by Cheapflights users on 9/18. 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.
Wed 10/77:00 am -
Nonstop4h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Alaska Airlines logo]()
$155
This Mytrip deal was found by Cheapflights users on 9/21. 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.
Wed 11/186:30 am -
2 stops14h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$156
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop10h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$157
This Southwest deal was found by Cheapflights users on 9/21. 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 10/177:05 pm -
Nonstop4h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Southwest logo]()
$159
This Alaska Airlines deal was found by Cheapflights users on 9/23. 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 10/217:00 am -
1 stop7h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Alaska Airlines logo]()
$162
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 September 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $271 (Kiwi.com) |
One-way from | $145 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $398 |
Good round-trip deal | $344 or less |
Good one-way deal | $195 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 7,457,451 searches. Data last updated September 23, 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
ChicagoSeattle
MDW Chicago Midway - SEA Seattle/Tacoma Intl
MDWSEA
Chicago Midway
Sat 10/17
7:05 pm-9:40 pm
Nonstop4h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Thu 10/22
7:16 pm-9:59 pm
Nonstop4h 43m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Wed 11/18
8:20 pm-11:07 pm
Nonstop4h 47m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Mon 11/16
7:00 am-9:50 am
Nonstop4h 50m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Mon 12/21
6:57 pm-9:56 pm
Nonstop4h 59m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Mon 12/14
9:00 am-2:18 pm
1 stop7h 18m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$162
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Wed 12/16
2:08 pm-6:42 pm
1 stop6h 34m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$162
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Tue 11/17
11:52 am-8:47 pm
1 stop10h 55m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$164
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Thu 10/22
12:55 pm-8:37 pm
1 stop9h 42m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$164
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Tue 10/13
12:55 pm-8:37 pm
1 stop9h 42m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$164
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.
MDW-SEA
ORD-SEA
PIA-SEA
ORD-GEG
ORD-PSC
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
MDW-SEA
ORD-SEA
PIA-SEA
ORD-GEG
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 $418). 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 September 23, 2026.
It’s typically best to fly out from Illinois to State of Washington in the evening. Doing so could potentially save you 16% 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 September 23, 2026.
The most flights from USIL to USWA are scheduled on a Tuesday (47 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (25 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 $284 and $444 in October.The cheapest round-trip price found within the last 5 days was $271 on Frontier (Oct 27-Oct 31).
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 Monday evenings 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 September 23, 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.
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Overall
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.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to Washington
See prices for flight routes from nearby airports that may be better suited for you.
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 September 23, 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 6 airlines flying from Illinois to Washington
Discover the top 6 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 7,457,451 searches. Data last updated September 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$131 | Average$270 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$432 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$177 | Average$441 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$181 | Average$479 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$191 | Average$548 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$233 | Average$387 | FlexibilityNo cancel fee | On-time63% |