$159+ Cheap flights from Washington to Illinois
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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
Dec 6 — Dec 131
Round-trip
1 adult, Economy
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Find cheap flights from Washington to Illinois 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 Washington to IllinoisExplore the most affordable flight options available from Washington to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2026.
Explore the most affordable flight options available from Washington to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2026.
This Kissandfly.com deal was found by Cheapflights users on 11/4. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/31:25 pm -
1 stop6h 31m
Wed 12/97:25 am -
1 stop10h 18m
Deal found 11/4![Frontier logo]()
$266
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/15:50 pm -
Nonstop4h 07m
Thu 12/37:18 pm -
1 stop6h 47m
Deal found 11/3![Delta logo]()
$267
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/36:00 am -
1 stop8h 50m
Fri 12/412:39 pm -
1 stop6h 31m
Deal found 11/3![Delta logo]()
$267
This Priceline deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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.
Sat 12/197:47 pm -
1 stop8h 02m
Wed 12/236:00 am -
Nonstop5h 00m
Deal found 11/3![Multiple Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 11/4. 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 12/15:50 pm -
Nonstop4h 07m
Wed 12/912:34 pm -
1 stop6h 36m
Deal found 11/4![Delta logo]()
$272
This Southwest deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:40 am -
2 stops7h 40m
Sun 12/65:55 am -
1 stop6h 45m
Deal found 11/4![Southwest logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/3111:43 am -
Nonstop4h 16m
Fri 1/83:19 pm -
Nonstop4h 43m
Deal found 11/3![Alaska Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 11/4. 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 12/46:30 am -
Nonstop3h 55m
Tue 12/88:45 pm -
Nonstop4h 50m
Deal found 11/4![Southwest logo]()
$277
This Orbitz deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:37 pm -
1 stop6h 16m
Wed 12/22:13 pm -
1 stop9h 44m
Deal found 11/3![Multiple Airlines logo]()
$278
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.
Sun 12/610:45 am -
1 stop11h 05m
Fri 12/115:20 pm -
2 stops7h 45m
Deal found 11/6![Southwest logo]()
$278
This Frontier deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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.
Sat 11/214:37 pm -
1 stop6h 16m
Wed 12/27:00 am -
1 stop10h 40m
Deal found 11/3![Frontier logo]()
$279
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 11/3012:15 am -
Nonstop3h 50m
Tue 12/810:10 am -
Nonstop4h 40m
Deal found 11/3![Southwest logo]()
$279
Best flights from Washington to IllinoisDiscover carefully curated flight deals from Washington to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 6, 2026.
Discover carefully curated flight deals from Washington to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 6, 2026.
This Delta deal was found by Cheapflights users on 11/4. 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.
Wed 12/91:25 pm -
1 stop6h 31m
Tue 1/52:25 pm -
Nonstop4h 40m
Deal found 11/4![Delta logo]()
$272
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 11/3012:15 am -
Nonstop3h 50m
Tue 12/810:10 am -
Nonstop4h 40m
Deal found 11/3![Southwest logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 1/2312:00 pm -
1 stop9h 59m
Mon 1/253:19 pm -
Nonstop4h 43m
Deal found 11/1![Alaska Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/157:00 am -
1 stop6h 07m
Mon 1/113:46 pm -
1 stop8h 42m
Deal found 11/3![United Airlines logo]()
$359
This American Airlines deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/152:07 pm -
1 stop7h 14m
Sat 1/21:53 pm -
1 stop9h 46m
Deal found 11/1![American Airlines logo]()
$521
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 11/3012:15 am -
Nonstop3h 50m
Wed 12/168:45 pm -
Nonstop4h 50m
Deal found 11/3![Southwest logo]()
$284
This Delta deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 12/911:59 pm -
1 stop9h 25m
Wed 12/164:29 pm -
1 stop9h 26m
Deal found 11/1![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 11/2611:40 am -
Nonstop4h 16m
Tue 12/12:13 pm -
1 stop22h 14m
Deal found 11/2![Alaska Airlines logo]()
$310
This Alaska Airlines deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 1/225:50 pm -
Nonstop4h 09m
Sun 1/247:40 am -
1 stop30h 08m
Deal found 11/1![Alaska Airlines logo]()
$310
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/46:10 am -
2 stops8h 55m
Sun 12/65:55 am -
1 stop6h 45m
Deal found 11/3![Southwest logo]()
$312
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/17:20 am -
Nonstop4h 10m
Tue 12/15:55 pm -
Nonstop4h 47m
Deal found 11/3![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:56 pm -
1 stop9h 12m
Sat 12/58:40 am -
2 stops9h 43m
Deal found 11/4![United Airlines logo]()
$371
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.
Thu 12/176:00 am -
1 stop10h 54m
Fri 1/16:00 am -
Nonstop5h 00m
Deal found 11/5![Alaska Airlines logo]()
$327
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/256:15 am -
Nonstop3h 55m
Thu 3/49:55 pm -
Nonstop4h 40m
Deal found 11/5![Southwest logo]()
$332
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.
Wed 12/96:00 am -
1 stop6h 53m
Wed 12/97:18 pm -
1 stop6h 47m
Deal found 11/5![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 11/252:30 pm -
Nonstop4h 10m
Fri 11/279:25 am -
Nonstop4h 54m
Deal found 11/1![United Airlines logo]()
$376
This Alaska Airlines deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 3/27:00 am -
1 stop9h 55m
Wed 3/176:00 am -
1 stop7h 05m
Deal found 11/3![Alaska Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 12/2611:42 pm -
Nonstop3h 43m
Sat 1/28:14 pm -
Nonstop4h 16m
Deal found 11/2![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 12/21:16 pm -
1 stop7h 38m
Tue 12/86:00 am -
1 stop8h 06m
Deal found 11/2![Delta logo]()
$363
This Southwest deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/235:25 pm -
1 stop9h 00m
Thu 12/248:45 pm -
Nonstop4h 50m
Deal found 11/4![Southwest logo]()
$367
This Alaska Airlines deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/218:09 pm -
1 stop15h 10m
Wed 12/306:00 am -
Nonstop5h 00m
Deal found 11/2![Alaska Airlines logo]()
$357
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.
Tue 1/261:17 pm -
1 stop8h 38m
Sat 1/306:00 am -
1 stop8h 07m
Deal found 11/5![Delta logo]()
$363
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/46:10 am -
2 stops8h 55m
Mon 12/78:45 pm -
1 stop13h 45m
Deal found 11/5![Southwest logo]()
$368
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.
Wed 12/97:00 am -
Nonstop3h 43m
Sun 12/137:46 pm -
Nonstop4h 29m
Deal found 11/6![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 11/265:35 am -
1 stop6h 12m
Thu 11/265:55 pm -
Nonstop4h 43m
Deal found 11/1![Delta logo]()
$367
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/258:15 pm -
1 stop7h 40m
Thu 12/318:45 pm -
1 stop13h 45m
Deal found 11/3![Southwest logo]()
$382
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 11/212:30 pm -
1 stop6h 43m
Wed 11/252:35 pm -
2 stops10h 40m
Deal found 11/6![United Airlines logo]()
$426
This Delta deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 12/11:16 pm -
1 stop7h 38m
Tue 12/159:37 am -
2 stops9h 20m
Deal found 11/2![Delta logo]()
$368
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.
Sat 2/610:02 am -
1 stop7h 36m
Tue 2/96:47 pm -
1 stop7h 10m
Deal found 11/5![Alaska Airlines logo]()
$409
This Southwest deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” 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 11/235:30 am -
Nonstop3h 50m
Tue 12/15:45 pm -
1 stop7h 05m
Deal found 11/1![Southwest logo]()
$389
Last-minute flights from Washington to IllinoisDiscover last-minute flight deals from Washington to Illinois. Data last updated November 6, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to Illinois. Data last updated November 6, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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.
Sat 11/214:37 pm -
1 stop6h 16m
Wed 12/27:00 am -
1 stop10h 40m
Deal found 11/3![Frontier logo]()
$279
This Orbitz deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:37 pm -
1 stop6h 16m
Wed 12/22:13 pm -
1 stop9h 44m
Deal found 11/3![Multiple Airlines logo]()
$278
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 11/3012:15 am -
Nonstop3h 50m
Tue 12/810:10 am -
Nonstop4h 40m
Deal found 11/3![Southwest logo]()
$279
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/15:50 pm -
Nonstop4h 07m
Fri 12/42:04 pm -
1 stop6h 43m
Deal found 11/3![Delta logo]()
$267
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/15:50 pm -
Nonstop4h 07m
Sun 12/66:20 am -
1 stop6h 25m
Deal found 11/3![Delta logo]()
$272
This Kissandfly.com deal was found by Cheapflights users on 11/4. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/31:25 pm -
1 stop6h 31m
Wed 12/97:25 am -
1 stop10h 18m
Deal found 11/4![Frontier logo]()
$266
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/36:00 am -
1 stop8h 50m
Fri 12/412:39 pm -
1 stop6h 31m
Deal found 11/3![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:40 am -
2 stops7h 40m
Sun 12/65:55 am -
1 stop6h 45m
Deal found 11/4![Southwest logo]()
$272
This Southwest deal was found by Cheapflights users on 11/4. 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 12/46:30 am -
Nonstop3h 55m
Tue 12/88:45 pm -
Nonstop4h 50m
Deal found 11/4![Southwest logo]()
$277
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.
Sun 12/610:45 am -
1 stop11h 05m
Fri 12/115:20 pm -
2 stops7h 45m
Deal found 11/6![Southwest logo]()
$278
This Priceline deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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.
Sat 12/197:47 pm -
1 stop8h 02m
Wed 12/236:00 am -
Nonstop5h 00m
Deal found 11/3![Multiple Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:53 pm -
Nonstop4h 08m
Sat 1/98:00 am -
Nonstop4h 47m
Deal found 11/4![Alaska Airlines logo]()
$277
One-way flights from Washington to IllinoisSearch for one-way flight options from Washington to Illinois. Find affordable one-way fares based on user searches. Data last updated November 6, 2026.
Search for one-way flight options from Washington to Illinois. Find affordable one-way fares based on user searches. Data last updated November 6, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 12/231:37 pm -
1 stop8h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$159
This Frontier deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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.
Sat 11/214:37 pm -
1 stop6h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$160
This American Airlines deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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.
Fri 12/186:29 am -
Nonstop4h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![American Airlines logo]()
$161
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/312:15 am -
Nonstop3h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Southwest logo]()
$161
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:43 pm -
1 stop30h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$161
This KAYAK deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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 12/17:20 am -
Nonstop4h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Delta logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/117:01 am -
1 stop8h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Alaska Airlines logo]()
$162
This Super.com deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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.
Tue 11/249:53 pm -
1 stop29h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$163
This iWofly 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/216:25 pm -
1 stop9h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Frontier logo]()
$164
This Southwest deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” 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 12/56:45 am -
2 stops11h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Southwest logo]()
$164
This Super.com deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” 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.
Mon 11/309:53 pm -
1 stop29h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$166
This Alaska Airlines deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/113:17 pm -
1 stop19h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Alaska Airlines logo]()
$167
Find flight deals from Washington to Illinois
Keep the following information in mind while searching for Washington to Illinois flight deals. Data was last updated November 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $266 (Kissandfly.com) |
One-way from | $159 (Cheapflightsfares) |
Popular in | June |
Cheapest in | February |
Average price | $387 |
Good round-trip deal | $388 or less |
Good one-way deal | $247 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington to Illinois 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 6, 2026.
Use the filters below to find and compare flights from Washington to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SpokaneChicago
GEG Spokane - ORD Chicago O'Hare Intl
GEGORD
Spokane
Fri 12/11
12:37 pm-11:59 pm
1 stop9h 22m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$162
SeattleChicago
SEA Seattle/Tacoma Intl - MDW Chicago Midway
SEAMDW
Seattle/Tacoma Intl
Sat 12/12
6:45 am-5:05 pm
2 stops8h 20m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$164
SpokaneChicago
GEG Spokane - ORD Chicago O'Hare Intl
GEGORD
Spokane
Mon 1/11
3:17 pm-1:13 pm
1 stop19h 56m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$167
SeattleChicago
SEA Seattle/Tacoma Intl - MDW Chicago Midway
SEAMDW
Seattle/Tacoma Intl
Thu 1/7
1:35 pm-9:45 pm
1 stop6h 10m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$171
SeattleChicago
SEA Seattle/Tacoma Intl - ORD Chicago O'Hare Intl
SEAORD
Seattle/Tacoma Intl
Thu 12/24
9:59 pm-1:10 pm
1 stop13h 11m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$176
SpokaneChicago
GEG Spokane - MDW Chicago Midway
GEGMDW
Spokane
Fri 11/27
6:25 am-4:39 pm
1 stop8h 14m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$182
SpokaneChicago
GEG Spokane - MDW Chicago Midway
GEGMDW
Spokane
Fri 12/11
6:45 am-4:50 pm
1 stop8h 05m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$182
SpokaneChicago
GEG Spokane - MDW Chicago Midway
GEGMDW
Spokane
Wed 12/2
5:35 am-5:05 pm
1 stop9h 30m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$182
SpokaneChicago
GEG Spokane - MDW Chicago Midway
GEGMDW
Spokane
Tue 1/12
1:15 pm-10:17 pm
1 stop7h 02m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$182
SpokaneChicago
GEG Spokane - ORD Chicago O'Hare Intl
GEGORD
Spokane
Fri 11/27
1:50 pm-9:47 pm
1 stop5h 57m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$182
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Washington with our price prediction graph.
GEG-ORD
SEA-MDW
GEG-MDW
SEA-PIA
SEA-ORD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Washington to Illinois
USWA-USIL
GEG-ORD
SEA-MDW
GEG-MDW
SEA-PIA
What is the cheapest month to book a flight from State of Washington to Illinois?
Currently, February is the cheapest month in which you can book a flight from State of Washington to Illinois (average of $273). Flying from State of Washington to Illinois in June 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 WA to IL?
Find hourly flight availability from Washington to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 6, 2026.
When flying from State of Washington to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 21% versus a flight in the morning.
Weekly flight availability from State of Washington to Illinois
Explore weekly flight availability from Washington to Illinois. 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 6, 2026.
The most flights from USWA to USIL are scheduled on a Wednesday (41 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).
How much does it cost to fly round-trip from State of Washington to Illinois?
Airfare is below average for this route at the moment.
State of Washington to Illinois flights typically cost between $302 and $476 in December.The cheapest round-trip price found within the last 5 days was $266 on Frontier (Dec 3-Dec 9).
How far ahead should I book a flight from State of Washington to Illinois?
To ensure you get the cheapest price possible for a flight from State of Washington to Illinois, you should look to book at least 60 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from State of Washington to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Washington to Illinois. Price data was last updated on October 31, 2026.
Travelers seeking maximum savings on their State of Washington to Illinois flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated November 6, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, andDelta from Washington to Illinois by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Washington to Illinois. 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 Washington to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Washington to Illinois by cabin class
Find flights from Washington to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Washington and Illinois flights
Browse other Washington and Illinois flight options. Last updated on November 6, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to Washington after your stay in Illinois
Washington to Illinois flights
Consider these flights traveling from Washington to Illinois.
Top 6 airlines flying from Washington to Illinois
Discover the top 6 airlines that operate flights from Washington to Illinois. 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 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$177 | Average$477 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$177 | Average$421 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$189 | Average$444 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$196 | Average$486 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$208 | Average$315 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$276 | Average$450 | FlexibilityNo cancel fee | On-time63% |