$55+ Cheap flights from Washington, D.C. (WAS) to Illinois
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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Sep 23 — Sep 301
Round-trip
1 adult, Economy
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Find cheap flights from Washington, D.C. 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Washington, D.C. to Illinois
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Cheapest flights from Washington, D.C. to IllinoisExplore the most affordable flight options available from Washington, D.C. to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 24, 2026.
Explore the most affordable flight options available from Washington, D.C. to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/236:38 am -
1 stop7h 32m
Wed 9/302:29 pm -
1 stop6h 01m
Deal found 8/24![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:40 am -
1 stop13h 00m
Mon 10/266:35 pm -
1 stop21h 09m
Deal found 8/21![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2910:22 am -
1 stop27h 48m
Fri 10/22:29 pm -
1 stop17h 56m
Deal found 8/23![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:29 pm -
1 stop21h 11m
Mon 10/266:35 pm -
1 stop14h 15m
Deal found 8/19![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/249:25 pm -
1 stop16h 45m
Mon 9/282:29 pm -
1 stop17h 56m
Deal found 8/24![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Mon 9/282:29 pm -
1 stop25h 17m
Deal found 8/20![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:00 am -
1 stop8h 10m
Fri 10/96:35 pm -
1 stop13h 52m
Deal found 8/20![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:25 pm -
1 stop16h 45m
Mon 9/212:29 pm -
1 stop17h 56m
Deal found 8/23![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am -
1 stop8h 10m
Fri 9/182:29 pm -
1 stop17h 56m
Deal found 8/19![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am -
1 stop8h 10m
Fri 9/252:29 pm -
1 stop25h 17m
Deal found 8/23![Frontier logo]()
$142
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:35 am -
Nonstop2h 00m
Wed 9/306:30 am -
Nonstop1h 45m
Deal found 8/21![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:25 am -
Nonstop2h 21m
Wed 12/911:10 am -
Nonstop2h 05m
Deal found 8/21![United Airlines logo]()
$177
Best flights from Washington, D.C. to IllinoisDiscover carefully curated flight deals from Washington, D.C. to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 24, 2026.
Discover carefully curated flight deals from Washington, D.C. to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 24, 2026.
This Southwest deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:45 pm -
Nonstop2h 00m
Wed 9/303:05 pm -
Nonstop1h 50m
Deal found 8/23![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/59:09 am -
Nonstop2h 20m
Thu 10/87:30 am -
Nonstop2h 00m
Deal found 8/19![United Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:25 am -
1 stop6h 14m
Mon 10/195:29 pm -
1 stop4h 38m
Deal found 8/22![Delta logo]()
$197
This American Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 11/66:22 pm -
1 stop6h 45m
Wed 11/1111:20 am -
1 stop5h 44m
Deal found 8/24![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/510:00 pm -
Nonstop2h 05m
Mon 11/96:10 pm -
Nonstop1h 50m
Deal found 8/21![Southwest logo]()
$177
This Southwest deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/222:50 pm -
Nonstop2h 00m
Wed 9/236:30 am -
Nonstop1h 45m
Deal found 8/23![Southwest logo]()
$177
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1611:10 am -
1 stop6h 49m
Sat 9/193:40 pm -
1 stop7h 04m
Deal found 8/22![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:30 pm -
Nonstop2h 22m
Fri 9/182:00 pm -
Nonstop2h 08m
Deal found 8/20![United Airlines logo]()
$216
This Delta deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:20 am -
1 stop5h 08m
Mon 10/55:10 pm -
1 stop4h 52m
Deal found 8/23![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/261:55 pm -
1 stop4h 20m
Mon 9/287:55 pm -
Nonstop1h 55m
Deal found 8/20![Southwest logo]()
$183
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/28:20 am -
Nonstop2h 18m
Mon 10/59:52 pm -
Nonstop2h 06m
Deal found 8/24![United Airlines logo]()
$216
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:40 pm -
1 stop5h 19m
Wed 10/710:30 am -
1 stop5h 07m
Deal found 8/21![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:40 am -
1 stop3h 45m
Mon 11/26:10 pm -
Nonstop1h 50m
Deal found 8/21![Southwest logo]()
$183
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/282:00 pm -
1 stop6h 11m
Sat 10/3110:35 am -
1 stop5h 57m
Deal found 8/22![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1310:50 am -
1 stop4h 30m
Thu 10/1511:00 am -
Nonstop1h 45m
Deal found 8/22![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/109:30 am -
Nonstop2h 17m
Mon 10/125:59 am -
Nonstop1h 55m
Deal found 8/23![United Airlines logo]()
$234
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:15 pm -
1 stop4h 15m
Wed 9/3011:17 am -
1 stop4h 13m
Deal found 8/20![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:50 pm -
1 stop5h 15m
Mon 10/268:50 am -
Nonstop1h 45m
Deal found 8/19![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:46 am -
Nonstop2h 14m
Mon 10/125:59 am -
Nonstop1h 55m
Deal found 8/20![United Airlines logo]()
$236
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:57 am -
1 stop6h 35m
Mon 10/196:10 am -
1 stop4h 40m
Deal found 8/20![Delta logo]()
$197
This American Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:24 pm -
1 stop4h 41m
Mon 9/214:57 pm -
1 stop6h 02m
Deal found 8/20![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3010:50 am -
1 stop3h 15m
Sat 10/32:20 pm -
2 stops7h 25m
Deal found 8/23![Southwest logo]()
$193
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:15 pm -
1 stop4h 15m
Sat 9/197:05 am -
1 stop3h 28m
Deal found 8/22![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:25 am -
Nonstop2h 21m
Sat 10/1710:49 am -
Nonstop2h 09m
Deal found 8/22![United Airlines logo]()
$252
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:12 pm -
1 stop6h 45m
Thu 10/225:29 pm -
1 stop4h 47m
Deal found 8/21![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/169:25 am -
1 stop5h 55m
Wed 9/234:40 pm -
1 stop4h 30m
Deal found 8/19![Southwest logo]()
$197
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:05 am -
Nonstop2h 21m
Thu 9/177:45 pm -
Nonstop2h 14m
Deal found 8/20![United Airlines logo]()
$253
This American Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:43 pm -
1 stop4h 25m
Sun 9/66:49 pm -
1 stop4h 10m
Deal found 8/22![American Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 10/16:10 am -
1 stop3h 57m
Mon 10/59:29 am -
1 stop6h 01m
Deal found 8/24![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:30 am -
Nonstop2h 15m
Fri 9/184:00 pm -
Nonstop2h 09m
Deal found 8/20![United Airlines logo]()
$255
Last-minute flights from Washington, D.C. to IllinoisDiscover last-minute flight deals from Washington, D.C. to Illinois. Data last updated August 24, 2026 and is based on user searches.
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated August 24, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/146:00 am -
1 stop8h 10m
Wed 9/162:29 pm -
1 stop6h 01m
Deal found 8/24![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am -
1 stop8h 10m
Fri 9/182:29 pm -
1 stop17h 56m
Deal found 8/21![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:25 pm -
1 stop16h 45m
Fri 9/182:29 pm -
1 stop25h 17m
Deal found 8/24![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:38 am -
1 stop7h 32m
Fri 9/182:29 pm -
1 stop25h 17m
Deal found 8/21![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:25 pm -
1 stop16h 45m
Mon 9/212:29 pm -
1 stop17h 56m
Deal found 8/23![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am -
1 stop8h 10m
Fri 9/252:29 pm -
1 stop25h 17m
Deal found 8/23![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” 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 9/236:38 am -
1 stop7h 32m
Wed 9/302:29 pm -
1 stop6h 01m
Deal found 8/24![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Mon 9/282:29 pm -
1 stop25h 17m
Deal found 8/20![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/249:25 pm -
1 stop16h 45m
Mon 9/282:29 pm -
1 stop17h 56m
Deal found 8/24![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 am -
1 stop8h 10m
Mon 9/282:29 pm -
1 stop25h 17m
Deal found 8/23![Frontier logo]()
$150
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:35 am -
Nonstop2h 00m
Wed 9/306:30 am -
Nonstop1h 45m
Deal found 8/21![Southwest logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:25 pm -
1 stop16h 45m
Fri 10/22:29 pm -
1 stop17h 56m
Deal found 8/24![Frontier logo]()
$129
One-way flights from Washington, D.C. to IllinoisSearch for one-way flight options from Washington, D.C. to Illinois. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.
Search for one-way flight options from Washington, D.C. to Illinois. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:25 pm -
1 stop16h 45m
Deal found 8/23![Frontier logo]()
$55
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Deal found 8/21![Frontier logo]()
$56
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:22 am -
1 stop8h 18m
Deal found 8/24![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:12 pm -
1 stop21h 28m
Deal found 8/24![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/185:40 am -
1 stop13h 00m
Deal found 8/21![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2610:22 am -
1 stop8h 18m
Deal found 8/21![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am -
1 stop8h 10m
Deal found 8/20![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:12 pm -
1 stop21h 28m
Deal found 8/21![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/179:12 pm -
1 stop13h 28m
Deal found 8/19![Frontier logo]()
$79
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:10 pm -
Nonstop2h 23m
Deal found 8/19![United Airlines logo]()
$89
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:27 pm -
Nonstop2h 13m
Deal found 8/24![United Airlines logo]()
$89
This Southwest deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:30 pm -
Nonstop2h 05m
Deal found 8/24![Southwest logo]()
$89
Find flight deals from Washington, D.C. to Illinois
Keep the following information in mind while searching for Washington, D.C. to Illinois flight deals. Data was last updated August 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $113 (Kiwi.com) |
One-way from | $55 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $295 |
Good round-trip deal | $274 or less |
Good one-way deal | $174 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington, D.C. 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 August 24, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Wed 9/23
5:45 pm-6:45 pm
Nonstop2h 00m
Chicago Midway
Wed 9/30
3:05 pm-5:55 pm
Nonstop1h 50m
$177
BaltimoreChicago
BWI Baltimore/Washington - ORD Chicago O'Hare Intl
BWIORD
Baltimore/Washington
Mon 10/5
9:09 am-10:29 am
Nonstop2h 20m
Chicago O'Hare Intl
Thu 10/8
7:30 am-10:30 am
Nonstop2h 00m
$177
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Thu 11/5
10:00 pm-11:05 pm
Nonstop2h 05m
Chicago Midway
Mon 11/9
6:10 pm-9:00 pm
Nonstop1h 50m
$177
Quickest round-trip
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Tue 9/22
2:50 pm-3:50 pm
Nonstop2h 00m
Chicago Midway
Wed 9/23
6:30 am-9:15 am
Nonstop1h 45m
$177
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Sat 9/26
1:55 pm-5:15 pm
1 stop4h 20m
Chicago Midway
Mon 9/28
7:55 pm-10:50 pm
Nonstop1h 55m
$183
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Thu 10/29
10:40 am-1:25 pm
1 stop3h 45m
Chicago Midway
Mon 11/2
6:10 pm-9:00 pm
Nonstop1h 50m
$183
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Tue 10/13
10:50 am-2:20 pm
1 stop4h 30m
Chicago Midway
Thu 10/15
11:00 am-1:45 pm
Nonstop1h 45m
$187
Washington, D.C.Chicago
DCA Washington, D.C. Reagan-National - MDW Chicago Midway
DCAMDW
Washington, D.C. Reagan-National
Mon 10/19
6:50 pm-11:05 pm
1 stop5h 15m
Chicago Midway
Mon 10/26
8:50 am-11:35 am
Nonstop1h 45m
$187
BaltimoreChicago
BWI Baltimore/Washington - MDW Chicago Midway
BWIMDW
Baltimore/Washington
Wed 9/30
10:50 am-1:05 pm
1 stop3h 15m
Chicago Midway
Sat 10/3
2:20 pm-10:45 pm
2 stops7h 25m
$193
Washington, D.C.Chicago
DCA Washington, D.C. Reagan-National - ORD Chicago O'Hare Intl
DCAORD
Washington, D.C. Reagan-National
Sat 10/17
8:25 am-1:39 pm
1 stop6h 14m
Chicago O'Hare Intl
Mon 10/19
5:29 pm-11:07 pm
1 stop4h 38m
$197
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington, D.C. to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Washington, D.C. with our price prediction graph.
BWI-STL
BWI-MDW
DCA-ORD
IAD-MDW
IAD-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, D.C. to Illinois
WAS-USIL
BWI-STL
BWI-MDW
DCA-ORD
IAD-MDW
What is the cheapest month to book a flight from Washington, D.C. to Illinois?
Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $276). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $395). 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 WAS to IL?
Find hourly flight availability from Washington, D.C. 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 August 24, 2026.
One of the essential ways to save on airfare from Washington, D.C. to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 12% on airfare.
Weekly flight availability from Washington, D.C. to Illinois
Explore weekly flight availability from Washington, D.C. 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 August 24, 2026.
The most flights from WAS to USIL are scheduled on a Friday (90 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (71 on average).
How much does it cost to fly round-trip from Washington, D.C. to Illinois?
Airfare is below average for this route at the moment.
Washington, D.C. to Illinois flights typically cost between $230 and $379 in September.The cheapest round-trip price found within the last 5 days was $177 on United Airlines (Sep 22-Sep 24).
How far ahead should I book a flight from Washington, D.C. to Illinois?
The best time to book flights from Washington, D.C. to Illinois is 54 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from Washington, D.C. to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Illinois. Price data was last updated on August 22, 2026.
Travelers seeking maximum savings on their Washington, D.C. to Illinois flight should consider departing on Friday at noon when fares are most often at their lowest. Monday mornings 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 August 24, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
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, D.C. 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, D.C. to Illinois
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Complete your trip
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Washington, D.C. and Illinois flights
Browse other Washington, D.C. and Illinois flight options. Last updated on August 24, 2026.
Popular flight searches
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Washington, D.C. to Illinois flights
Consider these flights traveling from Washington, D.C. to Illinois.
Top 5 airlines flying from Washington, D.C. to Illinois
Discover the top 5 airlines that operate flights from Washington, D.C. 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 August 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$185 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$131 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$148 | Average$347 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$149 | Average$427 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$174 | Average$389 | FlexibilityNo cancel fee | On-time71% |