$72+ Cheap flights from Illinois to Washington
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Apr 15 — Apr 221
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 March 16, 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 March 16, 2026.
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/253:05 pm
ORD
- SEA
1 stop9h 05m
Southwest
Sat 5/22:15 pm
SEA
- ORD
1 stop7h 10m
Southwest
Deal found 3/11![Southwest logo]()
$181
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/139:40 pm
MDW
- SEA
Nonstop4h 30m
Southwest
Sat 5/1611:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/11![Southwest logo]()
$182
This American Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/910:00 pm
ORD
- SEA
Nonstop4h 36m
American Airlines
Sat 5/1611:33 pm
SEA
- ORD
Nonstop4h 06m
American Airlines
Deal found 3/11![American Airlines logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/129:42 pm
ORD
- SEA
1 stop14h 07m
Multiple Airlines
Sat 5/1611:06 am
SEA
- ORD
1 stop16h 29m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$184
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/251:55 pm
MDW
- SEA
1 stop6h 20m
Southwest
Sat 5/25:45 am
SEA
- MDW
2 stops9h 30m
Southwest
Deal found 3/11![Southwest logo]()
$186
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/294:50 pm
ORD
- SEA
1 stop9h 05m
Southwest
Wed 5/68:25 am
SEA
- ORD
1 stop12h 30m
Southwest
Deal found 3/11![Southwest logo]()
$187
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/59:40 pm
MDW
- SEA
Nonstop4h 30m
Southwest
Fri 5/811:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/11![Southwest logo]()
$189
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/229:06 am
ORD
- SEA
Nonstop4h 42m
United Airlines
Mon 4/2711:59 pm
SEA
- ORD
Nonstop4h 00m
United Airlines
Deal found 3/11![United Airlines logo]()
$189
This SmartFares deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 am
ORD
- SEA
Nonstop4h 37m
Alaska Airlines
Sat 4/1812:35 am
SEA
- ORD
Nonstop4h 04m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$191
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/291:18 pm
ORD
- SEA
1 stop8h 27m
United Airlines
Wed 5/67:00 am
SEA
- ORD
Nonstop4h 12m
United Airlines
Deal found 3/11![United Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/295:30 am
STL
- SEA
2 stops14h 30m
Southwest
Wed 5/611:40 am
SEA
- STL
2 stops9h 35m
Southwest
Deal found 3/11![Southwest logo]()
$197
This Trip.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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.
Sat 4/46:00 am
ORD
- SEA
Nonstop4h 37m
Multiple Airlines
Sat 4/1112:42 pm
SEA
- ORD
1 stop9h 56m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$198
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 March 16, 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 March 16, 2026.
This Southwest deal was found by Cheapflights users on 3/10. 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.
Sat 4/251:55 pm
MDW
- SEA
1 stop6h 20m
Southwest
Sat 5/29:00 am
SEA
- MDW
2 stops9h 05m
Southwest
Deal found 3/10![Southwest logo]()
$186
This Delta deal was found by Cheapflights users on 3/10. 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 4/297:15 am
ORD
- PDX
1 stop7h 37m
Delta
Wed 5/61:24 pm
PDX
- ORD
1 stop5h 54m
Delta
Deal found 3/10![Delta logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 5/63:52 pm
ORD
- SEA
1 stop9h 01m
Alaska Airlines
Sat 5/95:42 pm
SEA
- ORD
Nonstop4h 17m
Alaska Airlines
Deal found 3/13![Alaska Airlines logo]()
$266
This United Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/239:54 pm
ORD
- SEA
Nonstop4h 40m
United Airlines
Mon 4/277:37 pm
SEA
- ORD
1 stop7h 50m
United Airlines
Deal found 3/14![United Airlines logo]()
$275
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/127:30 am
MDW
- SEA
2 stops12h 30m
Southwest
Tue 5/197:10 pm
SEA
- MDW
1 stop8h 35m
Southwest
Deal found 3/11![Southwest logo]()
$186
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/307:15 am
ORD
- SEA
Nonstop4h 49m
Delta
Wed 5/66:00 am
SEA
- ORD
1 stop7h 10m
Delta
Deal found 3/14![Delta logo]()
$247
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/1610:35 am
MDW
- SEA
Nonstop4h 30m
Southwest
Tue 4/216:30 am
SEA
- MDW
2 stops8h 05m
Southwest
Deal found 3/12![Southwest logo]()
$232
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:35 pm
STL
- SEA
1 stop8h 19m
Delta
Mon 5/1111:59 pm
SEA
- STL
1 stop6h 47m
Delta
Deal found 3/11![Delta logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/285:52 pm
ORD
- GEG
1 stop7h 19m
Alaska Airlines
Sat 5/22:45 pm
GEG
- ORD
1 stop7h 14m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$277
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 5/68:00 pm
ORD
- PDX
Nonstop4h 35m
United Airlines
Thu 5/1411:55 pm
PDX
- ORD
Nonstop4h 05m
United Airlines
Deal found 3/12![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/116:40 am
MDW
- SEA
1 stop12h 40m
Southwest
Mon 5/1811:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/11![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/87:13 pm
MDW
- SEA
1 stop6h 31m
Delta
Fri 5/1511:59 pm
SEA
- MDW
1 stop6h 43m
Delta
Deal found 3/15![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 5/58:00 pm
ORD
- PDX
Nonstop4h 35m
United Airlines
Fri 5/84:15 pm
PDX
- ORD
1 stop6h 43m
United Airlines
Deal found 3/12![United Airlines logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 8/227:00 am
ORD
- GEG
1 stop6h 42m
Alaska Airlines
Sat 8/293:35 pm
GEG
- ORD
1 stop6h 06m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 5/19:35 pm
MDW
- SEA
Nonstop4h 30m
Southwest
Thu 5/1411:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/14![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/161:36 pm
ORD
- SEA
1 stop10h 14m
Delta
Mon 4/207:25 am
SEA
- ORD
1 stop9h 10m
Delta
Deal found 3/12![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 5/128:04 pm
ORD
- SEA
Nonstop4h 43m
United Airlines
Mon 5/2511:52 pm
SEA
- ORD
Nonstop4h 06m
United Airlines
Deal found 3/14![United Airlines logo]()
$296
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” 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 4/239:35 pm
MDW
- SEA
Nonstop4h 30m
Southwest
Mon 5/45:35 pm
SEA
- MDW
1 stop9h 50m
Southwest
Deal found 3/15![Southwest logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Sun 8/165:33 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
Wed 8/1911:25 am
PDX
- STL
Nonstop3h 48m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 3/10. 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.
Tue 4/287:35 am
ORD
- PDX
1 stop6h 42m
Delta
Thu 5/711:20 am
PDX
- ORD
1 stop10h 37m
Delta
Deal found 3/10![Delta logo]()
$266
This United Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 6/37:55 pm
ORD
- PDX
Nonstop4h 35m
United Airlines
Sat 6/65:00 pm
PDX
- ORD
Nonstop4h 13m
United Airlines
Deal found 3/14![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/196:45 am
MDW
- PDX
1 stop9h 05m
Southwest
Sat 5/2311:55 pm
PDX
- MDW
Nonstop3h 55m
Southwest
Deal found 3/11![Southwest logo]()
$256
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Fri 8/145:33 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
Mon 8/1710:45 am
PDX
- STL
Nonstop3h 48m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$318
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/301:24 pm
MDW
- SEA
1 stop7h 04m
Delta
Tue 5/511:14 pm
SEA
- MDW
1 stop7h 33m
Delta
Deal found 3/11![Delta logo]()
$277
This United Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
Fri 5/158:04 pm
ORD
- SEA
Nonstop4h 43m
United Airlines
Mon 5/187:36 pm
SEA
- ORD
1 stop7h 49m
United Airlines
Deal found 3/14![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/145:35 pm
MDW
- SEA
1 stop8h 00m
Southwest
Sat 4/189:00 am
SEA
- MDW
2 stops9h 05m
Southwest
Deal found 3/12![Southwest logo]()
$271
This Alaska Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 6/207:20 am
ORD
- GEG
1 stop6h 28m
Alaska Airlines
Thu 6/258:12 am
GEG
- ORD
1 stop8h 48m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$336
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 7/75:00 am
ORD
- PDX
1 stop6h 47m
United Airlines
Sat 7/1811:40 pm
PDX
- ORD
Nonstop4h 05m
United Airlines
Deal found 3/13![United Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:29 am
MDW
- SEA
1 stop9h 16m
Delta
Mon 4/1311:14 pm
SEA
- MDW
1 stop7h 33m
Delta
Deal found 3/11![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” 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 5/116:40 am
MDW
- SEA
1 stop12h 40m
Southwest
Thu 5/1411:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/15![Southwest logo]()
$273
Last-minute flights from Illinois to WashingtonDiscover last-minute flight deals from Illinois to Washington. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Washington. Data last updated March 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/13:29 pm
ORD
- SEA
1 stop22h 08m
Frontier
Wed 4/158:07 pm
SEA
- ORD
1 stop11h 43m
Frontier
Deal found 3/11![Frontier logo]()
$184
This Trip.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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.
Sat 4/46:00 am
ORD
- SEA
Nonstop4h 37m
Multiple Airlines
Sat 4/1112:42 pm
SEA
- ORD
1 stop9h 56m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$198
This SmartFares deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 am
ORD
- SEA
Nonstop4h 37m
Alaska Airlines
Sat 4/1812:35 am
SEA
- ORD
Nonstop4h 04m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 am
ORD
- SEA
Nonstop4h 37m
Hawaiian Airlines
Sat 4/1812:35 am
SEA
- ORD
Nonstop4h 04m
Hawaiian Airlines
Deal found 3/13![Hawaiian Airlines logo]()
$205
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/229:06 am
ORD
- SEA
Nonstop4h 42m
United Airlines
Mon 4/2711:59 pm
SEA
- ORD
Nonstop4h 00m
United Airlines
Deal found 3/11![United Airlines logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” 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 4/227:21 pm
ORD
- SEA
1 stop24h 21m
Frontier
Tue 4/2810:57 am
SEA
- ORD
1 stop16h 53m
Frontier
Deal found 3/15![Frontier logo]()
$203
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/253:05 pm
ORD
- SEA
1 stop9h 05m
Southwest
Sat 5/22:15 pm
SEA
- ORD
1 stop7h 10m
Southwest
Deal found 3/11![Southwest logo]()
$181
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/2510:15 am
MDW
- SEA
2 stops10h 00m
Southwest
Sat 5/25:45 pm
SEA
- MDW
1 stop10h 15m
Southwest
Deal found 3/12![Southwest logo]()
$186
This American Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/258:20 pm
ORD
- PDX
Nonstop4h 37m
American Airlines
Sat 5/211:47 pm
PDX
- ORD
Nonstop4h 02m
American Airlines
Deal found 3/11![American Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/294:50 pm
ORD
- SEA
1 stop9h 05m
Southwest
Wed 5/68:25 am
SEA
- ORD
1 stop12h 30m
Southwest
Deal found 3/11![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/291:18 pm
ORD
- SEA
1 stop8h 27m
United Airlines
Wed 5/67:00 am
SEA
- ORD
Nonstop4h 12m
United Airlines
Deal found 3/11![United Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/292:55 pm
MDW
- SEA
1 stop10h 40m
Southwest
Sun 5/311:55 pm
SEA
- MDW
Nonstop4h 00m
Southwest
Deal found 3/11![Southwest logo]()
$199
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 March 16, 2026.
Search for one-way flight options from Illinois to Washington. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
This Trip.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:19 pm
STL
- SEA
1 stop15h 08m
Frontier
Deal found 3/13![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:17 pm
STL
- PDX
1 stop17h 35m
Frontier
Deal found 3/12![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/258:17 pm
STL
- PDX
1 stop16h 03m
Frontier
Deal found 3/12![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:12 pm
STL
- PDX
1 stop22h 34m
Frontier
Deal found 3/11![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” 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 4/48:16 pm
STL
- SEA
1 stop17h 21m
Frontier
Deal found 3/15![Frontier logo]()
$87
This American Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 5/1210:00 pm
ORD
- SEA
Nonstop4h 36m
American Airlines
Deal found 3/12![American Airlines logo]()
$94
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/2510:15 am
MDW
- SEA
2 stops10h 00m
Southwest
Deal found 3/11![Southwest logo]()
$96
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/2911:55 am
ORD
- SEA
2 stops12h 35m
Southwest
Deal found 3/11![Southwest logo]()
$96
This CheapOair deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/195:33 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
Deal found 3/15![Alaska Airlines logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
MDW
- SEA
2 stops29h 49m
Frontier
Deal found 3/11![Frontier logo]()
$101
This American Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 5/910:00 pm
ORD
- SEA
Nonstop4h 36m
American Airlines
Deal found 3/11![American Airlines logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/88:08 pm
STL
- SEA
1 stop15h 41m
Frontier
Deal found 3/11![Frontier logo]()
$104
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 March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $181 (Southwest) |
One-way from | $72 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $315 |
Good round-trip deal | $235 or less |
Good one-way deal | $117 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 16, 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 - SEA
MDWSEA
Chicago Midway
Sat 4/25
1:55 pm-6:15 pm
1 stop6h 20m
Seattle/Tacoma Intl
Sat 5/2
9:00 am-8:05 pm
2 stops9h 05m
$186
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Tue 5/12
7:30 am-6:00 pm
2 stops12h 30m
Seattle/Tacoma Intl
Tue 5/19
7:10 pm-5:45 am
1 stop8h 35m
$186
ChicagoPortland
ORD - PDX
ORDPDX
Chicago O'Hare Intl
Wed 4/29
7:15 am-12:52 pm
1 stop7h 37m
Portland
Wed 5/6
1:24 pm-9:18 pm
1 stop5h 54m
$227
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Thu 4/16
10:35 am-1:05 pm
Nonstop4h 30m
Seattle/Tacoma Intl
Tue 4/21
6:30 am-4:35 pm
2 stops8h 05m
$232
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Mon 5/11
6:40 am-5:20 pm
1 stop12h 40m
Seattle/Tacoma Intl
Mon 5/18
11:55 pm-5:55 am
Nonstop4h 00m
$243
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Thu 4/30
7:15 am-10:04 am
Nonstop4h 49m
Seattle/Tacoma Intl
Wed 5/6
6:00 am-3:10 pm
1 stop7h 10m
$247
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Fri 5/1
9:35 pm-12:05 am
Nonstop4h 30m
Seattle/Tacoma Intl
Thu 5/14
11:55 pm-5:55 am
Nonstop4h 00m
$247
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Thu 4/23
9:35 pm-12:05 am
Nonstop4h 30m
Seattle/Tacoma Intl
Mon 5/4
5:35 pm-5:25 am
1 stop9h 50m
$247
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Fri 5/1
5:35 pm-11:54 pm
1 stop8h 19m
Seattle/Tacoma Intl
Mon 5/11
11:59 pm-8:46 am
1 stop6h 47m
$249
ChicagoPortland
MDW - PDX
MDWPDX
Chicago Midway
Tue 5/19
6:45 am-1:50 pm
1 stop9h 05m
Portland
Sat 5/23
11:55 pm-5:50 am
Nonstop3h 55m
$256
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.
ORD-SEA
MDW-SEA
STL-SEA
STL-PDX
ORD-PDX
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to Washington
USIL-USWA
ORD-SEA
MDW-SEA
STL-SEA
STL-PDX
What is the cheapest month to book a flight from Illinois to State of Washington?
Currently, October is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $112). Flying from Illinois to State of Washington in December is currently the most expensive (average of $178). 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 March 16, 2026.
It’s typically best to fly out from Illinois to State of Washington in the evening. Doing so could potentially save you 17% on the flight price compared to flying in the afternoon, which is usually more expensive.
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 March 14, 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 at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 March 16, 2026.
The most flights from USIL to USWA are scheduled on a Sunday (36 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (23 on average).
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 March 16, 2026.
See what other customers who have flown with Alaska Airlines,Delta, andHawaiian Airlines from Illinois to Washington have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
7.9
Boarding
8.1
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
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
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 March 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Washington
Find the right flight back to Illinois after your stay in Washington
Illinois to Washington flights
Consider these flights traveling from Illinois to Washington.
Top 7 airlines flying from Illinois to Washington
Discover the top 7 airlines that operate flights from Illinois to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$84 | Average$228 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$108 | Average$261 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$153 | Average$258 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$168 | Average$444 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$170 | Average$460 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$170 | Average$436 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$194 | Average$405 | FlexibilityNo cancel fee | On-time63% |