$91+ Cheap flights from Dulles Intl (IAD) 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Dulles Intl to Illinois with Cheapflights
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Cheapest flights from Dulles Intl to IllinoisExplore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/712:20 pm -
1 stop5h 06m
Tue 11/105:05 pm -
1 stop5h 16m
Deal found 9/16![Delta logo]()
$179
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/910:54 pm -
1 stop9h 11m
Wed 12/169:21 pm -
1 stop9h 30m
Deal found 9/15![Frontier logo]()
$181
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/38:05 am -
1 stop5h 46m
Wed 11/47:15 am -
1 stop8h 57m
Deal found 9/16![Frontier logo]()
$182
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:06 pm -
1 stop7h 31m
Thu 12/108:15 am -
1 stop8h 32m
Deal found 9/16![Frontier logo]()
$183
This Expedia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/227:54 am -
1 stop10h 51m
Sat 10/246:21 am -
1 stop9h 52m
Deal found 9/16![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/118:05 am -
1 stop5h 46m
Thu 11/1910:26 am -
1 stop5h 46m
Deal found 9/14![Frontier logo]()
$184
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:52 am -
1 stop10h 55m
Sat 11/77:25 am -
1 stop8h 47m
Deal found 9/16![Frontier logo]()
$184
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:00 am -
1 stop24h 16m
Sat 10/318:00 am -
1 stop11h 11m
Deal found 9/15![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/227:54 am -
1 stop11h 37m
Tue 10/277:15 am -
1 stop8h 57m
Deal found 9/16![Frontier logo]()
$187
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/227:54 am -
1 stop10h 51m
Wed 10/286:16 am -
1 stop9h 56m
Deal found 9/16![Frontier logo]()
$187
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/38:05 am -
1 stop10h 42m
Wed 11/46:16 am -
1 stop9h 56m
Deal found 9/16![Frontier logo]()
$188
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:06 pm -
1 stop15h 26m
Tue 10/206:00 am -
1 stop10h 13m
Deal found 9/16![Frontier logo]()
$189
Best flights from Dulles Intl to IllinoisDiscover carefully curated flight deals from Dulles Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Dulles Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 11/76:11 am -
Nonstop2h 19m
Sat 11/71:30 pm -
Nonstop2h 03m
Deal found 9/14![United Airlines logo]()
$215
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 11/76:00 am -
1 stop5h 37m
Tue 11/106:44 pm -
1 stop3h 37m
Deal found 9/15![Delta logo]()
$229
This Orbitz deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/188:05 am -
1 stop10h 42m
Sun 11/228:07 am -
1 stop5h 56m
Deal found 9/16![Frontier logo]()
$237
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/77:00 am -
2 stops10h 23m
Sat 11/1411:20 am -
2 stops6h 27m
Deal found 9/13![American Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 11/76:05 am -
1 stop4h 27m
Sat 11/74:19 pm -
1 stop7h 23m
Deal found 9/15![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:11 am -
Nonstop2h 19m
Fri 10/3010:32 am -
Nonstop2h 03m
Deal found 9/15![United Airlines logo]()
$261
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 10/136:05 am -
1 stop4h 27m
Mon 10/196:44 pm -
1 stop3h 32m
Deal found 9/15![Delta logo]()
$246
This United Airlines deal was found by Cheapflights users on 9/13. 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 11/108:23 am -
1 stop4h 47m
Sat 11/141:00 pm -
Nonstop2h 09m
Deal found 9/13![United Airlines logo]()
$265
This Delta deal was found by Cheapflights users on 9/15. 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 10/306:05 am -
1 stop5h 24m
Sat 10/316:10 am -
1 stop4h 40m
Deal found 9/15![Delta logo]()
$260
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 11/56:05 am -
1 stop4h 27m
Mon 11/96:00 am -
1 stop6h 54m
Deal found 9/15![Delta logo]()
$261
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Sat 10/316:15 am -
2 stops8h 42m
Sat 11/72:34 pm -
2 stops7h 25m
Deal found 9/12![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/310:47 pm -
Nonstop2h 14m
Sun 11/89:41 pm -
Nonstop1h 49m
Deal found 9/16![United Airlines logo]()
$310
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Wed 11/117:00 am -
2 stops9h 45m
Sat 11/146:40 am -
2 stops11h 07m
Deal found 9/12![American Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 9/15. 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 11/1312:32 pm -
1 stop4h 46m
Mon 11/166:44 pm -
1 stop3h 37m
Deal found 9/15![Delta logo]()
$276
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/2112:40 pm -
1 stop4h 10m
Tue 10/279:41 pm -
Nonstop1h 49m
Deal found 9/14![United Airlines logo]()
$312
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1710:30 am -
1 stop5h 36m
Sat 10/243:41 pm -
1 stop6h 11m
Deal found 9/15![United Airlines logo]()
$313
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/176:00 am -
1 stop5h 18m
Wed 10/215:04 pm -
1 stop6h 38m
Deal found 9/17![Delta logo]()
$291
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 10/316:00 am -
1 stop7h 16m
Wed 11/46:00 am -
1 stop7h 09m
Deal found 9/15![Delta logo]()
$291
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:18 pm -
Nonstop2h 14m
Mon 10/192:37 pm -
Nonstop2h 07m
Deal found 9/15![United Airlines logo]()
$321
This American Airlines deal was found by Cheapflights users on 9/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:15 am -
2 stops8h 42m
Mon 10/192:30 pm -
2 stops8h 28m
Deal found 9/14![American Airlines logo]()
$438
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/318:40 am -
Nonstop2h 32m
Mon 11/210:53 am -
1 stop5h 31m
Deal found 9/16![United Airlines logo]()
$333
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/259:11 am -
1 stop4h 13m
Wed 12/308:04 am -
2 stops8h 26m
Deal found 9/13![American Airlines logo]()
$452
This Delta deal was found by Cheapflights users on 9/12. 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.
Wed 10/710:14 am -
1 stop7h 10m
Tue 10/135:04 pm -
1 stop6h 38m
Deal found 9/12![Delta logo]()
$315
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:10 am -
1 stop5h 02m
Sat 10/102:28 pm -
1 stop5h 43m
Deal found 9/15![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 10/86:05 am -
1 stop4h 44m
Mon 10/127:20 pm -
1 stop4h 22m
Deal found 9/15![Delta logo]()
$321
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:57 am -
1 stop6h 02m
Sun 10/44:36 pm -
1 stop6h 12m
Deal found 9/15![American Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/712:40 pm -
1 stop4h 10m
Thu 10/1510:54 am -
Nonstop2h 05m
Deal found 9/16![United Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/156:05 am -
1 stop4h 27m
Mon 10/196:44 pm -
1 stop3h 32m
Deal found 9/16![Delta logo]()
$330
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/148:20 am -
Nonstop2h 21m
Sat 10/175:36 pm -
1 stop4h 16m
Deal found 9/16![United Airlines logo]()
$352
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/76:05 am -
1 stop4h 27m
Mon 10/126:44 pm -
1 stop3h 32m
Deal found 9/16![Delta logo]()
$335
Last-minute flights from Dulles Intl to IllinoisDiscover last-minute flight deals from Dulles Intl to Illinois. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Illinois. Data last updated September 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/66:13 pm -
1 stop22h 07m
Wed 10/147:44 pm -
2 stops13h 33m
Deal found 9/16![Frontier logo]()
$193
This Expedia deal was found by Cheapflights users on 9/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:50 am -
1 stop11h 41m
Wed 10/218:04 am -
1 stop11h 07m
Deal found 9/14![Frontier logo]()
$195
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:06 pm -
1 stop15h 26m
Tue 10/206:00 am -
1 stop10h 13m
Deal found 9/16![Frontier logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:06 pm -
1 stop13h 15m
Tue 10/277:15 am -
1 stop8h 57m
Deal found 9/14![Frontier logo]()
$184
This Expedia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/227:54 am -
1 stop10h 51m
Sat 10/246:21 am -
1 stop9h 52m
Deal found 9/16![Frontier logo]()
$183
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:00 am -
1 stop24h 16m
Sat 10/318:00 am -
1 stop11h 11m
Deal found 9/15![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/2212:30 pm -
1 stop7h 26m
Wed 10/287:15 am -
1 stop8h 57m
Deal found 9/16![Frontier logo]()
$187
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/227:54 am -
1 stop10h 51m
Wed 10/286:16 am -
1 stop9h 56m
Deal found 9/16![Frontier logo]()
$187
This Trip.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/227:54 am -
1 stop10h 51m
Tue 10/279:53 am -
1 stop6h 19m
Deal found 9/16![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Tue 10/278:05 am -
1 stop5h 46m
Sat 10/317:15 am -
1 stop8h 57m
Deal found 9/12![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/286:07 pm -
1 stop22h 30m
Tue 11/37:28 pm -
2 stops37h 53m
Deal found 9/15![Frontier logo]()
$192
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:52 am -
1 stop10h 55m
Sat 11/77:25 am -
1 stop8h 47m
Deal found 9/16![Frontier logo]()
$184
One-way flights from Dulles Intl to IllinoisSearch for one-way flight options from Dulles Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Dulles Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Super.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Wed 10/711:12 am -
1 stop12h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Sat 11/77:52 am -
1 stop10h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$91
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:50 am -
1 stop11h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$92
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:50 am -
1 stop10h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Sat 11/77:52 am -
1 stop11h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$93
This Priceline deal was found by Cheapflights users on 9/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:30 pm -
1 stop7h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$95
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Fri 11/66:07 pm -
1 stop22h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$96
This Expedia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Mon 11/239:35 pm -
1 stop28h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$97
This Super.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/1511:12 am -
1 stop7h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 12/148:46 am -
1 stop5h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$101
This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/38:05 am -
1 stop5h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/911:16 am -
1 stop30h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$106
Find flight deals from Dulles Intl to Illinois
Keep the following information in mind while searching for Dulles Intl to Illinois flight deals. Data was last updated September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $179 (Delta) |
One-way from | $91 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $286 |
Good round-trip deal | $347 or less |
Good one-way deal | $258 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Dulles Intl 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 17, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Sat 10/24
7:50 am-11:43 pm
1 stop16h 53m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$95
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Wed 11/4
6:11 am-7:30 am
Nonstop2h 19m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$108
Quickest round-trip
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sat 10/24
10:18 pm-11:31 pm
Nonstop2h 13m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$108
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Sat 10/10
6:05 am-9:32 am
1 stop4h 27m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$118
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Mon 11/23
8:40 am-10:12 am
Nonstop2h 32m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$128
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Thu 10/8
6:05 am-9:32 am
1 stop4h 27m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$133
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Sat 11/21
9:35 pm-11:59 pm
1 stop27h 24m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$145
Washington, D.C.Peoria
IAD Washington, D.C. Dulles Intl - PIA Greater Peoria
IADPIA
Washington, D.C. Dulles Intl
Thu 10/29
5:50 pm-8:18 am
1 stop15h 28m
Greater Peoria
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$147
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Fri 10/9
10:18 pm-11:32 pm
Nonstop2h 14m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$147
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sat 10/31
3:37 pm-5:00 pm
Nonstop2h 23m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$148
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Dulles Intl to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Dulles Intl with our price prediction graph.
IAD-MDW
IAD-ORD
IAD-PIA
IAD-MLI
IAD-STL
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. Dulles Intl Airport to Illinois
IAD-USIL
IAD-MDW
IAD-ORD
IAD-PIA
IAD-MLI
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?
Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $305). Flying from Washington, D.C. Dulles Intl Airport to Illinois in January is currently the most expensive (average of $447). 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 IAD to IL?
Find hourly flight availability from Dulles Intl 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 17, 2026.
It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Illinois in the evening. Doing so could potentially save you 16% on the flight price compared to flying in the afternoon, which is usually more expensive.
Weekly flight availability from Washington, D.C. Dulles Intl Airport to Illinois
Explore weekly flight availability from Dulles Intl 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 17, 2026.
The most flights from IAD to USIL are scheduled on a Tuesday (35 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Illinois?
Airfare is below average for this route at the moment.
Washington, D.C. Dulles Intl Airport to Illinois flights typically cost between $242 and $403 in November.The cheapest round-trip price found within the last 5 days was $179 on Delta (Nov 7-Nov 10).
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Illinois?
Booking 85 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Dulles Intl Airport to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Illinois. Price data was last updated on September 12, 2026.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Illinois flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated September 17, 2026.
See what other customers who have flown with Delta,United Airlines, andFrontier from Washington, D.C. Dulles Intl Airport to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Related info for your journey
Find useful and relevant information for your journey from Dulles Intl 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 Dulles Intl to Illinois
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Complete your trip
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Dulles Intl and Illinois flights
Browse other Dulles Intl and Illinois flight options. Last updated on September 17, 2026.
Popular flight searches
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Dulles Intl to Illinois flights
Consider these flights traveling from Dulles Intl to Illinois.
Top 3 airlines flying from Dulles Intl to Illinois
Discover the top 3 airlines that operate flights from Dulles Intl 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 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$90 | Average$240 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$149 | Average$441 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$208 | Average$387 | FlexibilityNo cancel fee | On-time69% |