$56+ Cheap flights from Washington, D.C. (WAS) 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Oct 4 — Oct 111
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 September 4, 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 September 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/306:38 am -
1 stop7h 32m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 8/31![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 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
Fri 10/236:35 pm -
1 stop13h 52m
Deal found 9/2![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 9/3![Frontier logo]()
$128
This CheapOair deal was found by Cheapflights users on 9/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Fri 10/22:29 pm -
1 stop7h 35m
Deal found 9/2![Frontier logo]()
$132
This Priceline deal was found by Cheapflights users on 9/4. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1310:16 am -
1 stop8h 24m
Mon 11/166:44 pm -
1 stop4h 49m
Deal found 9/4![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 9/1![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 pm -
1 stop16h 45m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 9/4![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/1410:22 am -
1 stop8h 18m
Wed 10/216:35 pm -
1 stop13h 52m
Deal found 8/31![Frontier logo]()
$153
This Frontier deal was found by Cheapflights users on 9/2. 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.
Mon 10/1910:22 am -
1 stop8h 18m
Wed 10/216:35 pm -
1 stop4h 59m
Deal found 9/2![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:24 am -
1 stop12h 16m
Mon 10/196:35 pm -
1 stop4h 59m
Deal found 9/4![Frontier logo]()
$164
This Travelocity deal was found by Cheapflights users on 9/2. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:58 am -
Nonstop2h 23m
Sun 10/186:00 am -
Nonstop2h 03m
Deal found 9/2![Frontier logo]()
$178
This Expedia deal was found by Cheapflights users on 9/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:58 am -
Nonstop2h 23m
Sun 10/116:00 am -
Nonstop2h 03m
Deal found 9/2![Frontier logo]()
$179
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 September 4, 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 September 4, 2026.
This Southwest deal was found by Cheapflights users on 9/3. 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 10/198:00 am -
Nonstop2h 25m
Thu 10/227:50 pm -
Nonstop2h 05m
Deal found 9/3![Southwest logo]()
$237
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Tue 9/298:20 am -
1 stop4h 53m
Tue 10/68:30 am -
Nonstop2h 16m
Deal found 9/1![United Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 9/2. 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.
Thu 2/410:05 am -
1 stop5h 38m
Mon 2/87:20 am -
1 stop6h 21m
Deal found 9/2![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 9/1. 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.
Sat 10/316:33 pm -
1 stop6h 38m
Wed 11/46:00 am -
1 stop6h 59m
Deal found 9/1![American Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 9/4. 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.
Mon 12/142:40 pm -
Nonstop2h 25m
Wed 12/164:00 pm -
Nonstop1h 55m
Deal found 9/4![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 9/3. 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.
Wed 1/65:00 pm -
1 stop4h 37m
Mon 1/256:59 pm -
1 stop4h 21m
Deal found 9/3![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 9/1. 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.
Tue 9/292:40 pm -
Nonstop2h 15m
Tue 10/68:05 am -
Nonstop1h 55m
Deal found 9/1![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 9/3. 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.
Mon 10/58:08 am -
1 stop5h 47m
Sat 10/1012:00 pm -
1 stop7h 14m
Deal found 9/3![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:00 am -
1 stop5h 51m
Sat 10/105:03 pm -
1 stop5h 56m
Deal found 8/30![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 9/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/38:25 am -
Nonstop2h 30m
Sat 11/77:00 am -
1 stop5h 55m
Deal found 9/2![Southwest logo]()
$247
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Wed 10/148:30 am -
Nonstop2h 15m
Tue 10/205:59 am -
Nonstop1h 55m
Deal found 9/2![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 9/1. 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.
Sun 11/17:58 pm -
1 stop5h 09m
Sat 11/74:10 pm -
1 stop6h 49m
Deal found 9/1![American Airlines logo]()
$295
This United Airlines deal was found by Cheapflights users on 9/1. 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 10/143:47 pm -
Nonstop2h 18m
Thu 10/152:37 pm -
Nonstop2h 07m
Deal found 9/1![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 10/276:05 am -
1 stop4h 44m
Thu 10/2912:00 pm -
1 stop4h 10m
Deal found 8/30![Delta logo]()
$275
This Southwest deal was found by Cheapflights users on 9/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:05 pm -
1 stop5h 35m
Thu 10/152:00 pm -
1 stop4h 50m
Deal found 9/2![Southwest logo]()
$257
This United Airlines deal was found by Cheapflights users on 9/1. 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.
Sat 10/311:17 pm -
Nonstop2h 23m
Mon 11/25:55 am -
Nonstop1h 54m
Deal found 9/1![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 10/275:36 pm -
1 stop4h 15m
Thu 10/297:20 pm -
1 stop4h 31m
Deal found 8/30![Delta logo]()
$275
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 10/16:00 am -
1 stop4h 35m
Mon 10/53:55 pm -
Nonstop2h 00m
Deal found 8/30![Southwest logo]()
$265
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Wed 11/410:09 am -
Nonstop2h 20m
Sat 11/711:00 am -
Nonstop2h 06m
Deal found 9/3![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 9/3. 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.
Sat 2/68:10 am -
1 stop7h 33m
Tue 2/97:20 am -
1 stop7h 20m
Deal found 9/3![Delta logo]()
$275
This Southwest deal was found by Cheapflights users on 9/3. 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.
Thu 12/2412:15 pm -
Nonstop2h 25m
Wed 12/308:10 am -
Nonstop1h 55m
Deal found 9/3![Southwest logo]()
$265
This United Airlines deal was found by Cheapflights users on 9/1. 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 10/149:09 am -
Nonstop2h 20m
Thu 10/157:45 pm -
Nonstop2h 14m
Deal found 9/1![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 9/3. 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 10/810:14 am -
1 stop14h 40m
Sat 10/1012:00 pm -
1 stop7h 14m
Deal found 9/3![Delta logo]()
$276
This Southwest deal was found by Cheapflights users on 9/3. 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 11/24:10 pm -
1 stop4h 00m
Sat 11/710:35 am -
1 stop5h 25m
Deal found 9/3![Southwest logo]()
$270
This United Airlines deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/3012:10 pm -
Nonstop2h 20m
Wed 10/77:30 am -
Nonstop2h 00m
Deal found 8/31![United Airlines logo]()
$311
This Delta deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/104:00 pm -
1 stop7h 30m
Mon 9/215:09 pm -
1 stop5h 35m
Deal found 8/30![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 9/3. 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 10/61:10 pm -
Nonstop2h 16m
Fri 10/99:52 pm -
Nonstop2h 06m
Deal found 9/3![United Airlines logo]()
$313
This Delta deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/116:00 am -
1 stop5h 13m
Mon 9/215:09 pm -
1 stop4h 31m
Deal found 8/31![Delta logo]()
$295
This Southwest deal was found by Cheapflights users on 9/3. 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 10/33:10 pm -
Nonstop2h 00m
Mon 10/58:55 pm -
Nonstop1h 55m
Deal found 9/3![Southwest logo]()
$299
This United Airlines deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 11/193:37 pm -
Nonstop2h 23m
Tue 12/19:30 pm -
Nonstop1h 44m
Deal found 8/31![United Airlines logo]()
$313
Last-minute flights from Washington, D.C. to IllinoisDiscover last-minute flight deals from Washington, D.C. to Illinois. Data last updated September 4, 2026 and is based on user searches.
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated September 4, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 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
Fri 9/252:29 pm -
1 stop25h 17m
Deal found 9/3![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 9/3![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/306:38 am -
1 stop7h 32m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 8/31![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 9/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Fri 10/22:29 pm -
1 stop7h 35m
Deal found 9/2![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 9/1![Frontier logo]()
$151
This Expedia deal was found by Cheapflights users on 9/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:58 am -
Nonstop2h 23m
Sun 10/116:00 am -
Nonstop2h 03m
Deal found 9/2![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/139:12 pm -
1 stop21h 28m
Fri 10/166:35 pm -
1 stop13h 52m
Deal found 8/31![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/1410:22 am -
1 stop8h 18m
Wed 10/216:35 pm -
1 stop13h 52m
Deal found 8/31![Frontier logo]()
$153
This Travelocity deal was found by Cheapflights users on 9/2. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:58 am -
Nonstop2h 23m
Sun 10/186:00 am -
Nonstop2h 03m
Deal found 9/2![Frontier logo]()
$178
This Frontier deal was found by Cheapflights users on 9/2. 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.
Mon 10/1910:22 am -
1 stop8h 18m
Wed 10/216:35 pm -
1 stop4h 59m
Deal found 9/2![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 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
Fri 10/236:35 pm -
1 stop13h 52m
Deal found 9/2![Frontier logo]()
$126
This deal was found by Cheapflights users on 9/3. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:27 pm -
1 stop6h 33m
Thu 10/293:16 pm -
1 stop5h 28m
Deal found 9/3![American Airlines logo]()
$180
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 September 4, 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 September 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/306:38 am -
1 stop7h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Frontier logo]()
$56
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/39:12 pm -
1 stop21h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 pm -
1 stop16h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 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
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:12 pm -
1 stop21h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 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 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 9/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:20 am -
Nonstop2h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 9/2. 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.
Thu 10/89:58 am -
Nonstop2h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 9/2. 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 9/297:50 am -
1 stop11h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 9/2. 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 9/297:50 am -
1 stop10h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$95
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 September 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (Kiwi.com) |
One-way from | $56 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $264 |
Good round-trip deal | $273 or less |
Good one-way deal | $162 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 September 4, 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
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Mon 10/5
6:00 am-1:10 pm
1 stop8h 10m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$78
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Wed 9/30
7:50 am-5:51 pm
1 stop11h 01m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$96
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Sun 9/27
7:50 am-5:46 pm
1 stop10h 56m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$120
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Thu 10/29
6:50 pm-8:15 pm
Nonstop2h 25m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$128
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Mon 9/28
7:40 pm-11:42 pm
1 stop5h 02m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Sat 12/5
10:15 am-4:24 pm
1 stop7h 09m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Mon 10/19
6:05 am-11:00 am
1 stop5h 55m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Thu 12/3
6:10 am-9:23 am
1 stop4h 13m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Tue 11/3
10:10 am-1:39 pm
1 stop4h 29m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Washington, D.C.St. Louis
DCA Washington, D.C. Reagan-National - STL Lambert-St Louis
DCASTL
Washington, D.C. Reagan-National
Sat 10/31
6:05 am-3:45 pm
2 stops10h 40m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$134
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.
DCA-STL
IAD-STL
DCA-MLI
DCA-ORD
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
DCA-STL
IAD-STL
DCA-MLI
DCA-ORD
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 $278). 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 September 4, 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 11% 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 September 4, 2026.
The most flights from WAS to USIL are scheduled on a Thursday (91 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (49 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 $209 and $376 in October.The cheapest round-trip price found within the last 5 days was $178 on Frontier (Oct 15-Oct 18).
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 29, 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 September 4, 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
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
8.0
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
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Washington, D.C. to Illinois by cabin class
Find flights from Washington, D.C. to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Washington, D.C. and Illinois flights
Browse other Washington, D.C. and Illinois flight options. Last updated on September 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 September 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$190 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$131 | Average$387 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$148 | Average$349 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$149 | Average$427 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$176 | Average$389 | FlexibilityNo cancel fee | On-time71% |