$159+ Cheap flights from Billings (BIL) 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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ORD
Sep 25 — Oct 21
Round-trip
1 adult, Economy
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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
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Cheapest flights from Billings to IllinoisExplore the most affordable flight options available from Billings to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 26, 2026.
Explore the most affordable flight options available from Billings to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 26, 2026.
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
1 stop5h 57m
Tue 9/297:13 pm -
1 stop5h 02m
Deal found 8/22![Delta logo]()
$281
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/212:28 pm -
1 stop7h 18m
Sat 10/318:40 am -
1 stop5h 49m
Deal found 8/25![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
1 stop7h 06m
Wed 9/3012:29 pm -
2 stops11h 05m
Deal found 8/22![Delta logo]()
$286
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
2 stops10h 59m
Wed 9/302:00 pm -
2 stops9h 34m
Deal found 8/22![Delta logo]()
$291
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/296:23 am -
1 stop5h 57m
Sat 10/32:00 pm -
1 stop7h 07m
Deal found 8/25![Delta logo]()
$301
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/215:20 am -
1 stop5h 35m
Sat 10/247:35 am -
1 stop5h 43m
Deal found 8/25![Delta logo]()
$301
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:57 pm -
1 stop7h 58m
Sat 9/263:29 pm -
1 stop5h 38m
Deal found 8/22![Delta logo]()
$310
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 11/412:58 pm -
2 stops9h 59m
Wed 11/118:04 am -
2 stops10h 45m
Deal found 8/25![Delta logo]()
$311
This Delta deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:20 am -
1 stop5h 35m
Mon 10/55:50 pm -
1 stop6h 25m
Deal found 8/23![Delta logo]()
$312
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am -
1 stop4h 17m
Sat 10/249:29 am -
2 stops11h 46m
Deal found 8/22![Delta logo]()
$315
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:22 pm -
1 stop11h 16m
Thu 10/18:55 pm -
1 stop25h 37m
Deal found 8/21![Multiple Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/226:33 pm -
1 stop5h 11m
Tue 9/295:47 pm -
1 stop6h 28m
Deal found 8/25![Delta logo]()
$329
Best flights from Billings to IllinoisDiscover carefully curated flight deals from Billings to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.
Discover carefully curated flight deals from Billings to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/215:20 am -
1 stop5h 35m
Sat 10/247:35 am -
1 stop5h 43m
Deal found 8/25![Delta logo]()
$301
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/192:29 pm -
1 stop5h 09m
Sat 9/266:00 am -
2 stops8h 14m
Deal found 8/22![United Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:13 pm -
1 stop7h 58m
Tue 9/84:32 pm -
1 stop7h 15m
Deal found 8/21![American Airlines logo]()
$435
This Delta deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:23 am -
1 stop5h 57m
Mon 10/57:13 pm -
1 stop5h 02m
Deal found 8/23![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:00 am -
2 stops9h 38m
Wed 9/164:40 pm -
1 stop5h 20m
Deal found 8/21![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:23 am -
1 stop10h 56m
Sat 9/262:00 pm -
1 stop7h 07m
Deal found 8/22![Delta logo]()
$343
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/226:23 am -
1 stop5h 57m
Tue 9/297:13 pm -
1 stop5h 02m
Deal found 8/25![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:33 pm -
1 stop5h 26m
Sun 12/66:33 am -
2 stops7h 45m
Deal found 8/22![United Airlines logo]()
$384
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:20 am -
1 stop7h 10m
Wed 9/165:47 pm -
1 stop6h 28m
Deal found 8/21![Delta logo]()
$354
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 11/75:00 am -
2 stops9h 02m
Tue 11/102:31 pm -
2 stops8h 59m
Deal found 8/25![United Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:20 am -
2 stops8h 27m
Sat 9/1210:40 am -
2 stops10h 27m
Deal found 8/21![Delta logo]()
$364
This American Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:13 pm -
1 stop7h 58m
Mon 9/74:32 pm -
1 stop7h 15m
Deal found 8/21![American Airlines logo]()
$534
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 11/75:00 am -
1 stop6h 38m
Tue 11/104:39 pm -
1 stop6h 51m
Deal found 8/25![United Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:23 am -
2 stops10h 59m
Fri 9/257:13 pm -
1 stop5h 02m
Deal found 8/22![Delta logo]()
$365
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:28 pm -
1 stop7h 18m
Tue 10/135:00 am -
1 stop5h 46m
Deal found 8/24![United Airlines logo]()
$425
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/185:20 am -
1 stop5h 35m
Tue 9/225:50 pm -
1 stop6h 25m
Deal found 8/22![Delta logo]()
$373
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/22:28 pm -
1 stop7h 18m
Wed 10/76:00 am -
1 stop8h 14m
Deal found 8/22![United Airlines logo]()
$455
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:26 am -
2 stops11h 33m
Wed 9/96:24 pm -
1 stop5h 51m
Deal found 8/21![Delta logo]()
$382
This American Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:00 am -
1 stop8h 31m
Sat 9/128:48 am -
2 stops14h 22m
Deal found 8/24![American Airlines logo]()
$732
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/216:30 am -
2 stops10h 30m
Sat 10/249:29 am -
2 stops11h 46m
Deal found 8/25![Delta logo]()
$400
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:00 pm -
1 stop6h 59m
Fri 11/273:56 pm -
1 stop6h 18m
Deal found 8/24![United Airlines logo]()
$490
This United Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 11/310:30 am -
1 stop7h 08m
Thu 11/51:00 pm -
1 stop5h 14m
Deal found 8/25![United Airlines logo]()
$521
This American Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:00 am -
1 stop8h 31m
Thu 9/106:00 am -
1 stop7h 43m
Deal found 8/22![American Airlines logo]()
$845
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:20 am -
1 stop5h 35m
Wed 9/168:25 am -
1 stop15h 50m
Deal found 8/24![Delta logo]()
$441
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:26 am -
2 stops9h 33m
Wed 9/97:13 pm -
1 stop5h 02m
Deal found 8/21![Delta logo]()
$463
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:30 am -
2 stops11h 44m
Tue 9/85:08 pm -
2 stops17h 33m
Deal found 8/22![United Airlines logo]()
$613
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
1 stop7h 06m
Thu 10/18:25 am -
2 stops10h 28m
Deal found 8/21![Delta logo]()
$465
This American Airlines deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 10/151:21 pm -
1 stop26h 56m
Sun 10/186:53 am -
1 stop15h 19m
Deal found 8/25![American Airlines logo]()
$1,103
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:23 am -
1 stop10h 56m
Sat 9/262:00 pm -
1 stop7h 07m
Deal found 8/22![Delta logo]()
$483
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:06 am -
1 stop4h 41m
Thu 10/810:01 am -
1 stop11h 14m
Deal found 8/22![Delta logo]()
$534
Last-minute flights from Billings to IllinoisDiscover last-minute flight deals from Billings to Illinois. Data last updated August 26, 2026 and is based on user searches.
Discover last-minute flight deals from Billings to Illinois. Data last updated August 26, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:23 am -
2 stops10h 59m
Tue 9/227:13 pm -
1 stop5h 02m
Deal found 8/24![Delta logo]()
$334
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:57 pm -
1 stop7h 58m
Sat 9/263:29 pm -
1 stop5h 38m
Deal found 8/22![Delta logo]()
$310
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/226:33 pm -
1 stop5h 11m
Tue 9/295:47 pm -
1 stop6h 28m
Deal found 8/25![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:23 am -
1 stop5h 57m
Sat 9/262:00 pm -
1 stop7h 07m
Deal found 8/24![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/232:29 pm -
1 stop7h 17m
Wed 9/305:00 am -
1 stop5h 46m
Deal found 8/22![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
1 stop5h 57m
Tue 9/297:13 pm -
1 stop5h 02m
Deal found 8/22![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
1 stop7h 06m
Wed 9/3012:29 pm -
2 stops11h 05m
Deal found 8/22![Delta logo]()
$286
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:23 am -
2 stops10h 59m
Wed 9/302:00 pm -
2 stops9h 34m
Deal found 8/22![Delta logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:22 pm -
1 stop11h 16m
Thu 10/18:55 pm -
1 stop25h 37m
Deal found 8/21![Multiple Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/296:23 am -
1 stop5h 57m
Sat 10/32:00 pm -
1 stop7h 07m
Deal found 8/25![Delta logo]()
$301
This Delta deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/295:20 am -
1 stop5h 35m
Sat 10/311:17 am -
2 stops12h 24m
Deal found 8/25![Delta logo]()
$306
This Delta deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:20 am -
1 stop5h 35m
Mon 10/55:50 pm -
1 stop6h 25m
Deal found 8/23![Delta logo]()
$312
One-way flights from Billings to IllinoisSearch for one-way flight options from Billings to Illinois. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.
Search for one-way flight options from Billings to Illinois. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:52 pm -
2 stops32h 42m
Deal found 8/24![Multiple Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:47 pm -
2 stops31h 47m
Deal found 8/22![Multiple Airlines logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/267:59 pm -
1 stop8h 17m
Deal found 8/24![Multiple Airlines logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:22 pm -
1 stop11h 16m
Deal found 8/22![Multiple Airlines logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:52 pm -
3 stops41h 32m
Deal found 8/24![Multiple Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:22 pm -
2 stops30h 01m
Deal found 8/23![Multiple Airlines logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:19 am -
1 stop25h 47m
Deal found 8/23![Allegiant Air logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:22 pm -
2 stops19h 35m
Deal found 8/23![Multiple Airlines logo]()
$205
This Trip.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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.
Fri 9/185:11 pm -
1 stop11h 27m
Deal found 8/25![Multiple Airlines logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:52 pm -
2 stops14h 25m
Deal found 8/24![Multiple Airlines logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” 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 9/185:11 pm -
2 stops23h 40m
Deal found 8/25![Multiple Airlines logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:11 pm -
2 stops25h 06m
Deal found 8/21![Multiple Airlines logo]()
$253
Find flight deals from Billings to Illinois
Keep the following information in mind while searching for Billings to Illinois flight deals. Data was last updated August 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $281 (Delta) |
One-way from | $159 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $469 |
Good round-trip deal | $472 or less |
Good one-way deal | $328 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Billings to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 26, 2026.
Use the filters below to find and compare flights from Billings to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Wed 10/21
5:20 am-11:55 am
1 stop5h 35m
Chicago O'Hare Intl
Sat 10/24
7:35 am-12:18 pm
1 stop5h 43m
$301
BillingsSt. Louis
BIL Billings Logan Intl - STL Lambert-St Louis
BILSTL
Billings Logan Intl
Sat 9/19
2:29 pm-8:38 pm
1 stop5h 09m
Lambert-St Louis
Sat 9/26
6:00 am-1:14 pm
2 stops8h 14m
$334
Quickest round-trip
BillingsChicago
BIL Billings Logan Intl - MDW Chicago Midway
BILMDW
Billings Logan Intl
Wed 9/30
6:23 am-1:20 pm
1 stop5h 57m
Chicago Midway
Mon 10/5
7:13 pm-11:15 pm
1 stop5h 02m
$340
BillingsChicago
BIL Billings Logan Intl - MDW Chicago Midway
BILMDW
Billings Logan Intl
Wed 9/23
6:23 am-6:19 pm
1 stop10h 56m
Chicago Midway
Sat 9/26
2:00 pm-8:07 pm
1 stop7h 07m
$343
BillingsChicago
BIL Billings Logan Intl - MDW Chicago Midway
BILMDW
Billings Logan Intl
Tue 9/22
6:23 am-1:20 pm
1 stop5h 57m
Chicago Midway
Tue 9/29
7:13 pm-11:15 pm
1 stop5h 02m
$349
BillingsSt. Louis
BIL Billings Logan Intl - STL Lambert-St Louis
BILSTL
Billings Logan Intl
Wed 9/9
5:20 am-1:30 pm
1 stop7h 10m
Lambert-St Louis
Wed 9/16
5:47 pm-11:15 pm
1 stop6h 28m
$354
BillingsSt. Louis
BIL Billings Logan Intl - STL Lambert-St Louis
BILSTL
Billings Logan Intl
Wed 9/9
5:00 am-3:38 pm
2 stops9h 38m
Lambert-St Louis
Wed 9/16
4:40 pm-9:00 pm
1 stop5h 20m
$359
BillingsSt. Louis
BIL Billings Logan Intl - STL Lambert-St Louis
BILSTL
Billings Logan Intl
Sun 9/6
5:20 am-2:47 pm
2 stops8h 27m
Lambert-St Louis
Sat 9/12
10:40 am-8:07 pm
2 stops10h 27m
$364
BillingsChicago
BIL Billings Logan Intl - MDW Chicago Midway
BILMDW
Billings Logan Intl
Sat 9/19
6:23 am-6:22 pm
2 stops10h 59m
Chicago Midway
Fri 9/25
7:13 pm-11:15 pm
1 stop5h 02m
$365
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Fri 9/18
5:20 am-11:55 am
1 stop5h 35m
Chicago O'Hare Intl
Tue 9/22
5:50 pm-11:15 pm
1 stop6h 25m
$373
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Billings to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Billings with our price prediction graph.
BIL-STL
BIL-ORD
BIL-MDW
BIL-MLI
BIL-EVV
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 Billings to Illinois
BIL-USIL
BIL-STL
BIL-ORD
BIL-MDW
BIL-MLI
What is the cheapest month to book a flight from Billings to Illinois?
Currently, February is the cheapest month in which you can book a flight from Billings to Illinois (average of $279). Flying from Billings to Illinois in July is currently the most expensive (average of $561). 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 BIL to IL?
Find hourly flight availability from Billings 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 26, 2026.
When flying from Billings to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from Billings to Illinois
Explore weekly flight availability from Billings to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 26, 2026.
The most flights from BIL to USIL are scheduled on a Monday (2 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 on average).
How much does it cost to fly round-trip from Billings to Illinois?
Airfare is below average for this route at the moment.
Billings to Illinois flights typically cost between $348 and $552 in October.The cheapest round-trip price found within the last 5 days was $281 on United Airlines (Oct 21-Oct 31).
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 26, 2026.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines from Billings 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
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Related info for your journey
Find useful and relevant information for your journey from Billings 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 Billings 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 Billings to Illinois by cabin class
Find flights from Billings to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Billings and Illinois flights
Browse other Billings and Illinois flight options. Last updated on August 26, 2026.
Popular flight searches
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Billings to Illinois flights
Consider these flights traveling from Billings to Illinois.
Top 3 airlines flying from Billings to Illinois
Discover the top 3 airlines that operate flights from Billings to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$230 | Average$492 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$249 | Average$397 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$311 | Average$473 | FlexibilityNo cancel fee | On-time71% |