$64+ Cheap flights from Dulles Intl (IAD) 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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Sep 5 — Sep 121
Round-trip
1 adult, Economy
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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 August 6, 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 August 6, 2026.
This Jettzy deal was found by Cheapflights users on 8/3. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:20 am -
1 stop5h 35m
Wed 9/96:25 am -
1 stop9h 53m
Deal found 8/3![Frontier logo]()
$189
This Trip.com deal was found by Cheapflights users on 8/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:39 pm -
1 stop12h 14m
Thu 8/279:20 am -
1 stop8h 09m
Deal found 8/4![Frontier logo]()
$190
This Trip.com deal was found by Cheapflights users on 8/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:20 am -
1 stop5h 35m
Thu 9/106:25 am -
1 stop9h 53m
Deal found 8/3![Frontier logo]()
$190
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:12 am -
1 stop12h 47m
Mon 9/2110:26 am -
1 stop5h 52m
Deal found 8/5![Frontier logo]()
$191
This Trip.com deal was found by Cheapflights users on 8/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:20 am -
1 stop5h 35m
Mon 8/316:05 am -
1 stop10h 09m
Deal found 8/3![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 8/196:20 am -
1 stop14h 48m
Tue 8/259:20 am -
1 stop8h 09m
Deal found 8/2![Frontier logo]()
$193
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:50 am -
1 stop10h 56m
Mon 9/216:25 am -
1 stop9h 53m
Deal found 8/5![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 8/196:20 am -
1 stop14h 48m
Mon 8/246:05 am -
1 stop9h 02m
Deal found 8/2![Frontier logo]()
$196
This Trip.com deal was found by Cheapflights users on 8/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:50 am -
1 stop10h 56m
Mon 9/146:25 am -
1 stop9h 53m
Deal found 8/1![Frontier logo]()
$196
This Delta deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/68:28 am -
1 stop5h 12m
Fri 9/115:10 pm -
1 stop5h 04m
Deal found 8/6![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:47 pm -
1 stop5h 49m
Fri 9/115:03 pm -
1 stop5h 11m
Deal found 8/4![Delta logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/2112:30 pm -
1 stop8h 05m
Mon 9/287:11 am -
1 stop11h 58m
Deal found 8/3![Frontier logo]()
$198
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 August 6, 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 August 6, 2026.
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:10 pm -
Nonstop2h 17m
Wed 9/910:50 am -
Nonstop2h 05m
Deal found 8/2![United Airlines logo]()
$216
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:00 am -
1 stop5h 22m
Wed 10/216:00 am -
1 stop4h 32m
Deal found 8/4![Delta logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Sat 9/1911:12 am -
1 stop9h 41m
Sat 9/268:33 pm -
1 stop12h 54m
Deal found 8/1![Multiple Airlines logo]()
$276
This American Airlines deal was found by Cheapflights users on 8/1. 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.
Fri 8/216:10 am -
2 stops7h 57m
Mon 8/241:46 pm -
2 stops8h 09m
Deal found 8/1![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/68:20 am -
Nonstop2h 18m
Tue 9/810:50 am -
Nonstop2h 05m
Deal found 8/5![United Airlines logo]()
$216
This Delta deal was found by Cheapflights users on 8/2. 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.
Sat 10/248:03 am -
1 stop7h 27m
Mon 10/268:05 am -
1 stop6h 44m
Deal found 8/2![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/134:02 pm -
Nonstop2h 18m
Thu 10/152:37 pm -
Nonstop2h 07m
Deal found 8/5![United Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:10 am -
1 stop3h 57m
Mon 10/56:05 am -
1 stop4h 25m
Deal found 8/5![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:30 am -
Nonstop2h 18m
Sat 10/2412:55 pm -
Nonstop2h 06m
Deal found 8/4![United Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:28 am -
1 stop4h 23m
Sat 8/296:42 pm -
1 stop3h 44m
Deal found 8/1![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:15 am -
Nonstop2h 15m
Mon 9/146:25 am -
Nonstop1h 48m
Deal found 8/2![United Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:08 am -
1 stop5h 24m
Fri 9/114:10 pm -
1 stop6h 04m
Deal found 8/3![Delta logo]()
$276
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:18 pm -
Nonstop2h 13m
Tue 10/68:50 am -
Nonstop2h 05m
Deal found 8/4![United Airlines logo]()
$255
This American Airlines deal was found by Cheapflights users on 8/1. 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 10/177:15 pm -
1 stop5h 41m
Fri 10/234:22 pm -
1 stop6h 36m
Deal found 8/1![American Airlines logo]()
$377
This American Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:57 am -
1 stop6h 02m
Sat 9/126:39 am -
1 stop4h 17m
Deal found 8/5![American Airlines logo]()
$389
This United Airlines deal was found by Cheapflights users on 8/2. 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.
Fri 9/115:15 pm -
1 stop5h 21m
Sat 9/128:40 am -
Nonstop2h 14m
Deal found 8/2![United Airlines logo]()
$266
This Delta deal was found by Cheapflights users on 8/3. 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.
Fri 10/1610:14 am -
1 stop5h 14m
Mon 10/195:29 pm -
1 stop4h 47m
Deal found 8/3![Delta logo]()
$304
This American Airlines deal was found by Cheapflights users on 8/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:57 am -
1 stop6h 02m
Sun 9/134:36 pm -
1 stop6h 12m
Deal found 8/4![American Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 8/2. 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.
Sat 10/106:05 am -
1 stop4h 39m
Fri 10/165:35 pm -
1 stop6h 07m
Deal found 8/2![Delta logo]()
$316
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:16 am -
1 stop6h 01m
Thu 9/108:40 am -
Nonstop2h 14m
Deal found 8/5![United Airlines logo]()
$289
This American Airlines deal was found by Cheapflights users on 8/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:57 am -
1 stop6h 02m
Sun 9/134:36 pm -
1 stop6h 12m
Deal found 8/4![American Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 8/3. 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 9/26:00 am -
1 stop6h 27m
Wed 9/96:08 am -
1 stop7h 03m
Deal found 8/3![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/1. 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.
Thu 9/310:27 pm -
Nonstop2h 13m
Sun 9/610:50 am -
Nonstop2h 05m
Deal found 8/1![United Airlines logo]()
$298
This American Airlines deal was found by Cheapflights users on 8/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:33 am -
1 stop6h 48m
Fri 9/111:26 pm -
1 stop4h 33m
Deal found 8/3![American Airlines logo]()
$423
This Delta deal was found by Cheapflights users on 8/2. 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 9/245:12 pm -
1 stop6h 22m
Tue 9/2912:04 pm -
1 stop7h 10m
Deal found 8/2![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sat 9/123:15 pm -
1 stop6h 29m
Mon 9/146:39 pm -
1 stop5h 05m
Deal found 8/3![United Airlines logo]()
$306
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:06 am -
1 stop5h 35m
Sat 9/512:09 pm -
1 stop6h 56m
Deal found 8/1![Delta logo]()
$319
This American Airlines deal was found by Cheapflights users on 8/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:57 am -
1 stop6h 28m
Sun 9/64:25 pm -
1 stop4h 28m
Deal found 8/4![American Airlines logo]()
$437
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:10 am -
Nonstop2h 15m
Sun 10/118:50 am -
Nonstop2h 05m
Deal found 8/5![United Airlines logo]()
$312
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am -
1 stop5h 13m
Mon 10/56:00 am -
1 stop4h 30m
Deal found 8/1![Delta logo]()
$319
Last-minute flights from Dulles Intl to IllinoisDiscover last-minute flight deals from Dulles Intl to Illinois. Data last updated August 6, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Illinois. Data last updated August 6, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 8/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:33 pm -
1 stop12h 29m
Sat 8/227:11 am -
1 stop9h 03m
Deal found 8/1![Frontier logo]()
$208
This Expedia deal was found by Cheapflights users on 8/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:20 am -
1 stop5h 35m
Sat 8/226:05 am -
1 stop10h 09m
Deal found 8/1![Frontier logo]()
$208
This Frontier deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:20 am -
1 stop5h 35m
Fri 8/2811:50 am -
1 stop10h 02m
Deal found 8/3![Frontier logo]()
$205
This Trip.com deal was found by Cheapflights users on 8/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:20 am -
1 stop5h 35m
Mon 8/316:05 am -
1 stop10h 09m
Deal found 8/3![Frontier logo]()
$191
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:47 pm -
1 stop5h 49m
Fri 9/115:03 pm -
1 stop5h 11m
Deal found 8/4![Delta logo]()
$197
This Jettzy deal was found by Cheapflights users on 8/3. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:20 am -
1 stop5h 35m
Wed 9/96:25 am -
1 stop9h 53m
Deal found 8/3![Frontier logo]()
$189
This Trip.com deal was found by Cheapflights users on 8/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:20 am -
1 stop5h 35m
Thu 9/106:25 am -
1 stop9h 53m
Deal found 8/3![Frontier logo]()
$190
This Trip.com deal was found by Cheapflights users on 8/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:50 am -
1 stop10h 56m
Mon 9/146:25 am -
1 stop9h 53m
Deal found 8/1![Frontier logo]()
$196
This Frontier deal was found by Cheapflights users on 8/2. 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.
Fri 9/117:50 am -
1 stop11h 01m
Sat 9/126:25 am -
1 stop9h 53m
Deal found 8/2![Frontier logo]()
$200
This Frontier deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:50 am -
1 stop11h 01m
Mon 9/146:25 am -
1 stop9h 53m
Deal found 8/3![Frontier logo]()
$203
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:50 am -
1 stop10h 56m
Mon 9/216:25 am -
1 stop9h 53m
Deal found 8/5![Frontier logo]()
$194
This Expedia deal was found by Cheapflights users on 8/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:50 am -
1 stop11h 01m
Mon 9/286:25 am -
1 stop9h 53m
Deal found 8/1![Frontier logo]()
$199
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 August 6, 2026.
Search for one-way flight options from Dulles Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated August 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Sun 8/308:39 pm -
1 stop21h 43m
Deal found 8/1![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Fri 9/117:50 am -
1 stop6h 20m
Deal found 8/3![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/147:50 am -
1 stop6h 20m
Deal found 8/2![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Sun 9/139:04 pm -
1 stop17h 06m
Deal found 8/3![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Fri 9/257:50 am -
1 stop6h 20m
Deal found 8/3![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Fri 9/187:50 am -
1 stop6h 20m
Deal found 8/3![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 8/268:39 pm -
1 stop21h 43m
Deal found 8/2![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/97:50 am -
1 stop6h 20m
Deal found 8/3![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/237:50 am -
1 stop6h 20m
Deal found 8/2![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/167:50 am -
1 stop6h 20m
Deal found 8/3![Frontier logo]()
$85
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/53:40 pm -
Nonstop2h 19m
Deal found 8/4![United Airlines logo]()
$89
This Frontier deal was found by Cheapflights users on 8/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:20 am -
1 stop5h 35m
Deal found 8/1![Frontier logo]()
$89
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 August 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $189 (Jettzy) |
One-way from | $64 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $274 |
Good round-trip deal | $363 or less |
Good one-way deal | $236 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 2,558,603 searches. Data last updated August 6, 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 - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sat 9/5
1:10 pm-2:27 pm
Nonstop2h 17m
Chicago O'Hare Intl
Wed 9/9
10:50 am-1:55 pm
Nonstop2h 05m
$216
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sun 9/6
8:20 am-9:38 am
Nonstop2h 18m
Chicago O'Hare Intl
Tue 9/8
10:50 am-1:55 pm
Nonstop2h 05m
$216
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Tue 10/13
4:02 pm-5:20 pm
Nonstop2h 18m
Chicago O'Hare Intl
Thu 10/15
2:37 pm-5:44 pm
Nonstop2h 07m
$255
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Wed 10/21
10:30 am-11:48 am
Nonstop2h 18m
Chicago O'Hare Intl
Sat 10/24
12:55 pm-4:01 pm
Nonstop2h 06m
$255
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 9/12
6:15 am-7:30 am
Nonstop2h 15m
Chicago O'Hare Intl
Mon 9/14
6:25 am-9:13 am
Nonstop1h 48m
$255
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sat 10/3
10:18 pm-11:31 pm
Nonstop2h 13m
Chicago O'Hare Intl
Tue 10/6
8:50 am-11:55 am
Nonstop2h 05m
$255
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Fri 9/11
5:15 pm-9:36 pm
1 stop5h 21m
Lambert-St Louis
Sat 9/12
8:40 am-11:54 am
Nonstop2h 14m
$266
Washington, D.C.Moline
IAD Washington, D.C. Dulles Intl - MLI Moline Quad-City
IADMLI
Washington, D.C. Dulles Intl
Sat 10/17
6:00 am-10:22 am
1 stop5h 22m
Moline Quad-City
Wed 10/21
6:00 am-11:32 am
1 stop4h 32m
$271
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl
IADORD
Washington, D.C. Dulles Intl
Sat 10/24
8:03 am-2:30 pm
1 stop7h 27m
Chicago O'Hare Intl
Mon 10/26
8:05 am-3:49 pm
1 stop6h 44m
$275
Washington, D.C.Chicago
IAD Washington, D.C. Dulles Intl - MDW Chicago Midway
IADMDW
Washington, D.C. Dulles Intl
Thu 10/1
6:10 am-9:07 am
1 stop3h 57m
Chicago Midway
Mon 10/5
6:05 am-11:30 am
1 stop4h 25m
$275
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-ORD
IAD-MLI
IAD-SPI
IAD-BMI
IAD-MDW
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-ORD
IAD-MLI
IAD-SPI
IAD-BMI
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?
Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $280). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $446). 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 August 6, 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 15% on the flight price compared to flying in the afternoon, which is usually more expensive.
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 $244 and $419 in August.The cheapest round-trip price found within the last 5 days was $190 on Frontier (Aug 25-Aug 27).
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 August 1, 2026.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Illinois flight should consider departing on Thursday 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 August 6, 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.
Food
7.2
Overall
7.8
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Overall
7.8
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Overall
7.8
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Overall
7.8
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
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Dulles Intl and Illinois flights
Browse other Dulles Intl and Illinois flight options. Last updated on August 6, 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 2,558,603 searches. Data last updated August 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$90 | Average$199 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$149 | Average$408 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$220 | Average$381 | FlexibilityNo cancel fee | On-time69% |