$137+ Cheap flights from Montana 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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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Cheapest flights from Montana to IllinoisExplore the most affordable flight options available from Montana to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Montana to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/21:50 pm -
1 stop9h 09m
Mon 12/76:47 pm -
1 stop16h 00m
Deal found 10/28![Alaska Airlines logo]()
$273
This American Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/41:47 pm -
Nonstop3h 35m
Mon 12/710:05 am -
Nonstop4h 12m
Deal found 10/28![American Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/212:38 pm -
Nonstop3h 02m
Mon 12/78:59 am -
Nonstop3h 34m
Deal found 10/28![United Airlines logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
Thu 12/37:28 pm -
2 stops28h 25m
Wed 12/96:21 am -
1 stop28h 03m
Deal found 10/25![Multiple Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/162:37 pm -
1 stop7h 09m
Tue 11/179:07 am -
Nonstop3h 38m
Deal found 10/26![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/31:47 pm -
Nonstop3h 35m
Wed 12/912:02 pm -
1 stop9h 35m
Deal found 10/29![American Airlines logo]()
$303
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/102:33 pm -
1 stop8h 26m
Mon 12/148:59 am -
Nonstop3h 34m
Deal found 10/28![United Airlines logo]()
$303
This Alaska Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/147:00 am -
1 stop8h 31m
Tue 1/58:00 am -
1 stop7h 12m
Deal found 10/27![Alaska Airlines logo]()
$306
This American Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/21:52 pm -
1 stop6h 19m
Wed 12/210:40 pm -
2 stops15h 22m
Deal found 10/28![American Airlines logo]()
$310
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/22:41 pm -
1 stop7h 13m
Mon 12/76:00 am -
1 stop8h 25m
Deal found 10/28![Delta logo]()
$313
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/45:25 am -
1 stop5h 38m
Mon 12/712:34 pm -
1 stop8h 28m
Deal found 10/29![Delta logo]()
$313
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/25:15 am -
1 stop5h 48m
Wed 12/25:33 pm -
1 stop7h 44m
Deal found 10/28![Delta logo]()
$313
Best flights from Montana to IllinoisDiscover carefully curated flight deals from Montana to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Montana to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/192:30 pm -
1 stop7h 24m
Mon 11/235:29 pm -
1 stop6h 54m
Deal found 10/27![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/42:03 pm -
1 stop8h 56m
Mon 12/76:00 am -
1 stop7h 23m
Deal found 10/26![Alaska Airlines logo]()
$313
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:05 am -
2 stops8h 00m
Sun 12/65:55 am -
1 stop5h 35m
Deal found 10/26![Southwest logo]()
$351
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/107:00 am -
1 stop6h 55m
Sat 11/145:48 pm -
1 stop5h 42m
Deal found 10/26![United Airlines logo]()
$353
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/101:04 pm -
1 stop7h 52m
Thu 12/177:18 pm -
1 stop6h 08m
Deal found 10/29![Delta logo]()
$313
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/41:19 pm -
2 stops9h 37m
Mon 12/712:34 pm -
1 stop8h 28m
Deal found 10/29![Delta logo]()
$318
This Southwest deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/148:05 am -
2 stops8h 00m
Mon 1/45:20 pm -
2 stops6h 30m
Deal found 10/27![Southwest logo]()
$356
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 12/46:30 am -
1 stop6h 00m
Sun 12/68:59 am -
Nonstop3h 34m
Deal found 10/26![United Airlines logo]()
$356
This Delta deal was found by Cheapflights users on 10/25. 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.
Fri 12/45:25 am -
1 stop5h 38m
Tue 12/83:47 pm -
2 stops9h 50m
Deal found 10/25![Delta logo]()
$318
This Alaska Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/234:08 pm -
1 stop6h 51m
Wed 1/278:00 am -
1 stop8h 28m
Deal found 10/29![Alaska Airlines logo]()
$398
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/37:00 am -
2 stops13h 56m
Mon 12/72:04 pm -
2 stops10h 05m
Deal found 10/27![Delta logo]()
$324
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/1412:48 pm -
Nonstop3h 03m
Sun 11/227:00 am -
1 stop7h 30m
Deal found 10/29![United Airlines logo]()
$394
This Alaska Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/54:13 pm -
1 stop6h 46m
Mon 3/86:00 am -
1 stop7h 32m
Deal found 10/27![Alaska Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/158:05 am -
2 stops8h 45m
Thu 12/175:20 pm -
2 stops6h 30m
Deal found 10/29![Southwest logo]()
$415
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/1612:48 pm -
Nonstop3h 02m
Sun 11/229:07 am -
Nonstop3h 38m
Deal found 10/27![United Airlines logo]()
$398
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/101:50 pm -
1 stop9h 09m
Wed 11/117:00 am -
1 stop8h 14m
Deal found 10/28![Alaska Airlines logo]()
$402
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:00 am -
1 stop4h 59m
Sat 1/26:30 pm -
1 stop6h 07m
Deal found 10/27![Delta logo]()
$346
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:45 am -
1 stop6h 30m
Sat 11/1412:55 pm -
1 stop7h 00m
Deal found 10/26![Southwest logo]()
$429
This United Airlines deal was found by Cheapflights users on 10/25. 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.
Sun 12/274:20 pm -
Nonstop3h 12m
Thu 12/316:50 am -
1 stop7h 38m
Deal found 10/25![United Airlines logo]()
$412
This Alaska Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/312:54 pm -
1 stop23h 16m
Mon 12/76:47 pm -
1 stop18h 27m
Deal found 10/27![Alaska Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 12/45:30 am -
1 stop5h 33m
Sat 12/53:47 pm -
1 stop5h 01m
Deal found 10/26![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/124:15 pm -
1 stop6h 50m
Mon 2/156:00 am -
1 stop5h 25m
Deal found 10/27![Southwest logo]()
$438
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/25:50 pm -
1 stop5h 09m
Mon 12/74:20 pm -
1 stop5h 39m
Deal found 10/27![United Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/257:00 am -
1 stop5h 52m
Tue 1/56:00 am -
2 stops12h 45m
Deal found 10/28![Delta logo]()
$361
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/184:10 pm -
1 stop7h 05m
Sun 1/106:15 am -
1 stop5h 35m
Deal found 10/26![Southwest logo]()
$438
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/106:15 am -
2 stops10h 37m
Sat 11/148:46 am -
1 stop8h 40m
Deal found 10/26![United Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/105:35 am -
2 stops9h 43m
Sat 11/1410:32 am -
2 stops12h 48m
Deal found 10/26![Delta logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/912:54 pm -
2 stops10h 05m
Fri 12/113:19 pm -
1 stop9h 02m
Deal found 10/29![Alaska Airlines logo]()
$491
This Southwest deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1911:20 am -
2 stops9h 15m
Mon 11/235:20 pm -
2 stops6h 30m
Deal found 10/27![Southwest logo]()
$447
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:23 pm -
1 stop6h 07m
Sat 11/217:00 am -
1 stop7h 40m
Deal found 10/29![United Airlines logo]()
$440
Last-minute flights from Montana to IllinoisDiscover last-minute flight deals from Montana to Illinois. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Montana to Illinois. Data last updated October 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:42 pm -
1 stop5h 48m
Fri 11/63:56 pm -
1 stop6h 18m
Deal found 10/28![United Airlines logo]()
$353
This Expedia deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/510:27 am -
1 stop12h 32m
Thu 11/126:35 pm -
1 stop16h 04m
Deal found 10/28![Alaska Airlines logo]()
$402
This Priceline deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:59 pm -
1 stop9h 41m
Tue 11/103:59 pm -
1 stop7h 53m
Deal found 10/26![Alaska Airlines logo]()
$419
This Priceline deal was found by Cheapflights users on 10/25. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:59 pm -
1 stop9h 41m
Fri 11/139:30 am -
1 stop9h 49m
Deal found 10/25![Alaska Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/142:30 pm -
1 stop7h 24m
Sat 11/215:29 pm -
1 stop6h 54m
Deal found 10/29![Delta logo]()
$371
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:20 am -
2 stops11h 44m
Tue 11/176:00 am -
1 stop8h 20m
Deal found 10/26![Delta logo]()
$318
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/163:30 pm -
1 stop5h 00m
Tue 11/176:05 am -
1 stop5h 30m
Deal found 10/26![Southwest logo]()
$346
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/192:30 pm -
1 stop7h 24m
Mon 11/235:29 pm -
1 stop6h 54m
Deal found 10/27![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/202:09 pm -
1 stop8h 50m
Fri 11/276:00 am -
1 stop7h 27m
Deal found 10/26![Alaska Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/245:20 am -
2 stops10h 19m
Tue 12/16:00 am -
1 stop8h 25m
Deal found 10/27![Delta logo]()
$411
This Southwest deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:05 pm -
1 stop7h 20m
Tue 12/15:45 pm -
1 stop5h 45m
Deal found 10/27![Southwest logo]()
$415
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/2612:25 pm -
2 stops9h 55m
Sun 11/299:59 am -
1 stop5h 41m
Deal found 10/29![Delta logo]()
$404
One-way flights from Montana to IllinoisSearch for one-way flight options from Montana to Illinois. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from Montana to Illinois. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This Priceline deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/17:00 am -
1 stop8h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Alaska Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/1410:27 am -
2 stops37h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:03 am -
1 stop18h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/710:27 am -
2 stops37h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$146
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/57:20 am -
Nonstop3h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![United Airlines logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 12/139:47 pm -
1 stop30h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Multiple Airlines logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/1110:27 am -
2 stops37h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$154
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 12/52:41 pm -
1 stop7h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Delta logo]()
$157
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/233:09 pm -
1 stop7h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Delta logo]()
$157
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:20 am -
2 stops11h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Delta logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/610:18 am -
2 stops23h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$162
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/56:00 am -
2 stops13h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Delta logo]()
$162
Find flight deals from Montana to Illinois
Keep the following information in mind while searching for Montana to Illinois flight deals. Data was last updated October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $273 (Alaska Airlines) |
One-way from | $137 (Priceline) |
Popular in | September |
Cheapest in | January |
Average price | $414 |
Good round-trip deal | $384 or less |
Good one-way deal | $269 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Montana 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 October 30, 2026.
Use the filters below to find and compare flights from Montana 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
Sun 12/13
9:47 pm-5:01 am
1 stop30h 14m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$150
BozemanChicago
BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl
BZNORD
Bozeman Gallatin Field
Mon 11/23
3:09 pm-11:59 pm
1 stop7h 50m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$157
BozemanChicago
BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl
BZNORD
Bozeman Gallatin Field
Tue 12/1
4:25 pm-11:59 pm
1 stop6h 34m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$157
BozemanChicago
BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl
BZNORD
Bozeman Gallatin Field
Sat 12/5
8:25 am-9:56 pm
2 stops12h 31m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$162
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Mon 1/11
3:54 pm-12:26 am
2 stops31h 32m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Mon 1/11
2:38 pm-11:58 pm
1 stop8h 20m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$177
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Thu 11/5
5:20 am-11:55 am
1 stop5h 35m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$177
BillingsChicago
BIL Billings Logan Intl - ORD Chicago O'Hare Intl
BILORD
Billings Logan Intl
Sun 2/21
5:45 am-12:25 pm
1 stop5h 40m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$177
BozemanChicago
BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl
BZNORD
Bozeman Gallatin Field
Mon 3/1
3:40 pm-11:46 pm
1 stop7h 06m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$180
Quickest round-trip
BozemanChicago
BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl
BZNORD
Bozeman Gallatin Field
Thu 1/14
12:52 pm-5:00 pm
Nonstop3h 08m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$188
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Montana to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Montana with our price prediction graph.
BZN-MDW
BIL-ORD
BZN-ORD
FCA-ORD
MSO-ORD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Montana to Illinois
USMT-USIL
BZN-MDW
BIL-ORD
BZN-ORD
FCA-ORD
What is the cheapest month to book a flight from Montana to Illinois?
Currently, January is the cheapest month in which you can book a flight from Montana to Illinois (average of $331). Flying from Montana to Illinois in November is currently the most expensive (average of $532). 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 MT to IL?
Find hourly flight availability from Montana 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 October 30, 2026.
When flying from Montana 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.
How much does it cost to fly round-trip from Montana to Illinois?
Airfare is below average for this route at the moment.
Montana to Illinois flights typically cost between $348 and $773 in December.The cheapest round-trip price found within the last 5 days was $273 on Alaska Airlines (Dec 2-Dec 7).
How far ahead should I book a flight from Montana to Illinois?
Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from Montana to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 October 30, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andDelta from Montana to Illinois by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Overall
7.9
Food
7.0
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Related info for your journey
Find useful and relevant information for your journey from Montana 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 Montana to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Montana to Illinois by cabin class
Find flights from Montana to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Montana and Illinois flights
Browse other Montana and Illinois flight options. Last updated on October 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to Montana after your stay in Illinois
Montana to Illinois flights
Consider these flights traveling from Montana to Illinois.
Top 3 airlines flying from Montana to Illinois
Discover the top 3 airlines that operate flights from Montana 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 October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$216 | Average$424 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$229 | Average$396 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$249 | Average$505 | FlexibilityNo cancel fee | On-time69% |