$147+ 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 12/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Dec 11 — Dec 181
Round-trip
1 adult, Economy
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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 November 11, 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 November 11, 2026.
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/276:00 am -
Nonstop4h 41m
Wed 12/24:58 pm -
1 stop5h 55m
Deal found 11/5![Multiple Airlines logo]()
$274
This Priceline deal was found by Cheapflights users on 11/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop10h 40m
Fri 12/44:58 pm -
1 stop5h 55m
Deal found 11/10![Frontier logo]()
$275
This Southwest deal was found by Cheapflights users on 11/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/310:10 am -
Nonstop4h 40m
Wed 12/96:30 am -
Nonstop3h 55m
Deal found 11/10![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:25 pm -
1 stop9h 37m
Sun 12/61:25 pm -
1 stop6h 31m
Deal found 11/10![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 11/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/410:00 am -
2 stops13h 40m
Tue 12/87:00 am -
1 stop8h 25m
Deal found 11/10![Southwest logo]()
$278
This Expedia deal was found by Cheapflights users on 11/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:00 am -
Nonstop4h 57m
Sun 12/611:40 pm -
Nonstop3h 57m
Deal found 11/10![Alaska Airlines logo]()
$278
This Delta deal was found by Cheapflights users on 11/9. 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.
Tue 12/16:40 am -
Nonstop4h 57m
Sat 12/511:15 pm -
1 stop9h 44m
Deal found 11/9![Delta logo]()
$283
This United Airlines deal was found by Cheapflights users on 11/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:30 pm -
1 stop9h 31m
Wed 1/67:00 am -
Nonstop4h 12m
Deal found 11/10![United Airlines logo]()
$284
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/29:00 am -
Nonstop5h 00m
Sat 12/197:47 pm -
1 stop8h 02m
Deal found 11/5![Multiple Airlines logo]()
$285
This Cheapflightsfares deal was found by Cheapflights users on 11/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:35 am -
1 stop11h 35m
Mon 12/286:25 pm -
1 stop9h 24m
Deal found 11/9![Frontier logo]()
$286
This Southwest deal was found by Cheapflights users on 11/9. 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 12/25:45 pm -
1 stop7h 05m
Fri 12/411:20 am -
Nonstop3h 50m
Deal found 11/9![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:13 pm -
1 stop8h 43m
Sat 12/58:09 am -
Nonstop4h 12m
Deal found 11/7![Alaska Airlines logo]()
$287
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 November 11, 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 November 11, 2026.
This Southwest deal was found by Cheapflights users on 11/6. 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.
Thu 12/38:45 pm -
Nonstop4h 50m
Wed 12/96:30 am -
Nonstop3h 55m
Deal found 11/6![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 11/6. 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 1/126:47 pm -
Nonstop4h 45m
Mon 1/185:50 pm -
Nonstop4h 09m
Deal found 11/6![Alaska Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/94:29 pm -
1 stop9h 26m
Wed 12/166:00 am -
1 stop7h 48m
Deal found 11/10![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 11/7. 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.
Tue 5/45:20 pm -
1 stop7h 09m
Wed 5/1211:20 pm -
2 stops10h 31m
Deal found 11/7![United Airlines logo]()
$346
This American Airlines deal was found by Cheapflights users on 11/6. 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.
Sat 12/124:04 pm -
1 stop8h 34m
Mon 12/143:28 pm -
1 stop6h 35m
Deal found 11/6![American Airlines logo]()
$411
This Sun Country Air deal was found by Cheapflights users on 11/8. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/178:10 pm -
1 stop22h 53m
Sun 1/36:28 pm -
1 stop21h 09m
Deal found 11/8![Sun Country Air logo]()
$415
This Alaska Airlines deal was found by Cheapflights users on 11/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/156:00 am -
Nonstop4h 57m
Sun 1/311:39 pm -
Nonstop4h 01m
Deal found 11/9![Alaska Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 11/6. 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.
Tue 1/193:50 pm -
1 stop9h 10m
Wed 1/275:25 am -
1 stop9h 00m
Deal found 11/6![Southwest logo]()
$319
This Delta deal was found by Cheapflights users on 11/5. 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.
Sun 2/76:00 am -
Nonstop4h 50m
Mon 2/155:55 pm -
Nonstop4h 00m
Deal found 11/5![Delta logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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.
Wed 12/169:00 am -
1 stop7h 18m
Fri 1/15:00 am -
1 stop7h 21m
Deal found 11/5![Alaska Airlines logo]()
$323
This Southwest deal was found by Cheapflights users on 11/8. 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 1/910:00 am -
2 stops12h 05m
Wed 1/1310:35 am -
Nonstop4h 00m
Deal found 11/8![Southwest logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 11/8. 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.
Fri 12/259:01 am -
Nonstop4h 59m
Tue 12/295:48 pm -
Nonstop4h 11m
Deal found 11/8![Alaska Airlines logo]()
$324
This Southwest deal was found by Cheapflights users on 11/8. 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 12/512:50 pm -
2 stops11h 00m
Sat 12/1210:55 am -
1 stop7h 55m
Deal found 11/8![Southwest logo]()
$337
This United Airlines deal was found by Cheapflights users on 11/7. 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 12/96:42 am -
2 stops9h 07m
Mon 12/149:01 am -
2 stops10h 02m
Deal found 11/7![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 11/6. 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.
Fri 2/55:00 pm -
1 stop8h 25m
Tue 2/96:00 am -
1 stop8h 22m
Deal found 11/6![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 11/9. 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.
Thu 1/77:59 pm -
Nonstop4h 29m
Mon 1/117:05 am -
Nonstop3h 52m
Deal found 11/9![United Airlines logo]()
$409
This Southwest deal was found by Cheapflights users on 11/9. 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 1/2910:20 am -
Nonstop4h 50m
Mon 2/16:20 am -
Nonstop3h 55m
Deal found 11/9![Southwest logo]()
$339
This Alaska Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/218:00 am -
Nonstop4h 47m
Fri 1/298:11 am -
Nonstop4h 10m
Deal found 11/6![Alaska Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 11/6. 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 1/107:15 am -
1 stop6h 35m
Tue 1/1912:35 pm -
1 stop9h 24m
Deal found 11/6![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:46 pm -
Nonstop4h 29m
Sat 12/127:00 am -
Nonstop3h 43m
Deal found 11/6![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 11/6. 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 2/78:00 am -
Nonstop4h 47m
Wed 2/175:54 pm -
Nonstop4h 05m
Deal found 11/6![Alaska Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 11/9. 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.
Mon 1/2510:20 am -
Nonstop4h 50m
Mon 2/86:45 am -
2 stops9h 10m
Deal found 11/9![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 11/6. 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 12/512:00 pm -
1 stop6h 57m
Sat 12/126:00 am -
2 stops8h 43m
Deal found 11/6![Delta logo]()
$410
This Alaska Airlines deal was found by Cheapflights users on 11/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/228:59 pm -
Nonstop4h 54m
Sun 12/275:48 pm -
Nonstop4h 11m
Deal found 11/10![Alaska Airlines logo]()
$348
This Southwest deal was found by Cheapflights users on 11/9. 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.
Thu 1/217:55 pm -
Nonstop4h 50m
Sun 1/246:20 am -
Nonstop3h 55m
Deal found 11/9![Southwest logo]()
$358
This United Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/249:25 am -
Nonstop4h 54m
Fri 11/2710:56 pm -
Nonstop4h 10m
Deal found 11/6![United Airlines logo]()
$443
This Delta deal was found by Cheapflights users on 11/9. 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.
Tue 5/412:00 pm -
1 stop10h 46m
Sun 5/911:35 pm -
1 stop9h 42m
Deal found 11/9![Delta logo]()
$411
This American Airlines deal was found by Cheapflights users on 11/9. 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.
Wed 12/167:00 pm -
1 stop7h 47m
Mon 1/119:58 am -
1 stop8h 38m
Deal found 11/9![American Airlines logo]()
$637
This Southwest deal was found by Cheapflights users on 11/9. 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.
Thu 12/1010:15 am -
2 stops9h 35m
Tue 12/155:15 am -
2 stops10h 10m
Deal found 11/9![Southwest logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 11/6. 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 1/108:00 am -
Nonstop4h 47m
Fri 1/2211:35 am -
Nonstop4h 14m
Deal found 11/6![Alaska Airlines logo]()
$368
Last-minute flights from Illinois to WashingtonDiscover last-minute flight deals from Illinois to Washington. Data last updated November 11, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Washington. Data last updated November 11, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/276:00 am -
Nonstop4h 41m
Wed 12/24:58 pm -
1 stop5h 55m
Deal found 11/5![Multiple Airlines logo]()
$274
This Expedia deal was found by Cheapflights users on 11/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:00 am -
Nonstop4h 57m
Sun 12/611:40 pm -
Nonstop3h 57m
Deal found 11/10![Alaska Airlines logo]()
$278
This Delta deal was found by Cheapflights users on 11/9. 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.
Tue 12/16:40 am -
Nonstop4h 57m
Sat 12/511:15 pm -
1 stop9h 44m
Deal found 11/9![Delta logo]()
$283
This Priceline deal was found by Cheapflights users on 11/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop10h 40m
Fri 12/44:58 pm -
1 stop5h 55m
Deal found 11/10![Frontier logo]()
$275
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:25 pm -
1 stop9h 37m
Sun 12/61:25 pm -
1 stop6h 31m
Deal found 11/10![Delta logo]()
$277
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/29:00 am -
Nonstop5h 00m
Sat 12/197:47 pm -
1 stop8h 02m
Deal found 11/5![Multiple Airlines logo]()
$285
This Southwest deal was found by Cheapflights users on 11/9. 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 12/25:45 pm -
1 stop7h 05m
Fri 12/411:20 am -
Nonstop3h 50m
Deal found 11/9![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:13 pm -
1 stop8h 43m
Sat 12/58:09 am -
Nonstop4h 12m
Deal found 11/7![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 11/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/310:10 am -
Nonstop4h 40m
Wed 12/96:30 am -
Nonstop3h 55m
Deal found 11/10![Southwest logo]()
$277
This Southwest deal was found by Cheapflights users on 11/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/410:00 am -
2 stops13h 40m
Tue 12/87:00 am -
1 stop8h 25m
Deal found 11/10![Southwest logo]()
$278
This United Airlines deal was found by Cheapflights users on 11/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:30 pm -
1 stop9h 31m
Wed 1/67:00 am -
Nonstop4h 12m
Deal found 11/10![United Airlines logo]()
$284
This Cheapflightsfares deal was found by Cheapflights users on 11/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:35 am -
1 stop11h 35m
Mon 12/286:25 pm -
1 stop9h 24m
Deal found 11/9![Frontier logo]()
$286
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 November 11, 2026.
Search for one-way flight options from Illinois to Washington. Find affordable one-way fares based on user searches. Data last updated November 11, 2026.
This Super.com deal was found by Cheapflights users on 11/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:35 am -
1 stop11h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Frontier logo]()
$147
This Trip.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:00 am -
Nonstop4h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Alaska Airlines logo]()
$148
This United Airlines deal was found by Cheapflights users on 11/5. 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 1/610:47 am -
1 stop9h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![United Airlines logo]()
$149
This Southwest deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2210:30 pm -
Nonstop4h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Southwest logo]()
$150
This Delta deal was found by Cheapflights users on 11/9. 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.
Tue 12/226:00 am -
Nonstop4h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$150
This Southwest deal was found by Cheapflights users on 11/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/48:45 pm -
Nonstop4h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Southwest logo]()
$154
This KAYAK deal was found by Cheapflights users on 11/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/812:58 pm -
Nonstop4h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Delta logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 11/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/226:00 am -
Nonstop5h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Alaska Airlines logo]()
$155
This KAYAK deal was found by Cheapflights users on 11/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1010:24 am -
1 stop8h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Delta logo]()
$160
This United Airlines deal was found by Cheapflights users on 11/9. 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 12/195:45 pm -
1 stop7h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![United Airlines logo]()
$160
This American Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/198:45 pm -
Nonstop4h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![American Airlines logo]()
$161
This Southwest deal was found by Cheapflights users on 11/8. 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.
Sun 12/65:45 am -
1 stop8h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Southwest logo]()
$164
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 November 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $275 (Priceline) |
One-way from | $147 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $381 |
Good round-trip deal | $330 or less |
Good one-way deal | $154 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 November 11, 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
Wed 1/6
7:55 pm-10:45 pm
Nonstop4h 50m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$150
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Wed 12/23
2:27 pm-5:15 pm
Nonstop4h 48m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$150
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Tue 12/22
6:00 am-9:00 am
Nonstop5h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$155
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Sat 12/19
5:45 pm-11:16 pm
1 stop7h 31m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$160
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Thu 12/24
6:57 pm-9:56 pm
Nonstop4h 59m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$165
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Thu 1/28
4:55 pm-7:38 pm
Nonstop4h 43m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$165
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Thu 12/24
3:59 pm-11:18 pm
1 stop9h 19m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$175
ChicagoSeattle
ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl
ORDSEA
Chicago O'Hare Intl
Fri 11/27
6:00 am-8:41 am
Nonstop4h 41m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$175
ChicagoSeattle
MDW Chicago Midway - SEA Seattle/Tacoma Intl
MDWSEA
Chicago Midway
Tue 12/15
10:15 am-6:35 pm
2 stops10h 20m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$189
ChicagoSeattle
MDW Chicago Midway - SEA Seattle/Tacoma Intl
MDWSEA
Chicago Midway
Thu 12/3
1:20 pm-10:50 pm
2 stops11h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$189
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
ORD-BLI
MLI-SEA
ORD-GEG
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
ORD-BLI
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 $260). Flying from Illinois to State of Washington in July is currently the most expensive (average of $420). 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 November 11, 2026.
It’s typically best to fly out from Illinois to State of Washington at noon. Doing so could potentially save you 18% 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 November 11, 2026.
The most flights from USIL to USWA are scheduled on a Monday (46 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 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 $324 and $485 in December.The cheapest round-trip price found within the last 5 days was $275 on Frontier (Dec 2-Dec 4).
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 90 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 November 11, 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.
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Entertainment
7.4
Crew
8.6
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
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 November 11, 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 November 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$131 | Average$288 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$454 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$177 | Average$462 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$478 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$198 | Average$562 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$233 | Average$396 | FlexibilityNo cancel fee | On-time63% |