$109+ Cheap flights from Illinois to Montana
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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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Cheapest flights from Illinois to MontanaExplore the most affordable flight options available from Illinois to Montana. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
Explore the most affordable flight options available from Illinois to Montana. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/295:42 am
STL
- BZN
1 stop6h 23m
American Airlines
Sat 9/56:26 am
BZN
- STL
1 stop8h 48m
American Airlines
Deal found 6/11![American Airlines logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:03 pm
STL
- BZN
1 stop21h 58m
Multiple Airlines
Sun 8/164:51 pm
BZN
- STL
1 stop24h 24m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$224
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/258:00 am
STL
- BZN
1 stop5h 05m
Delta
Sat 9/56:00 am
BZN
- STL
1 stop6h 38m
Delta
Deal found 6/11![Delta logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:21 pm
STL
- FCA
1 stop14h 43m
Multiple Airlines
Mon 8/3112:14 pm
FCA
- STL
1 stop28h 54m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/306:20 am
STL
- BZN
1 stop5h 01m
Delta
Wed 9/23:55 pm
BZN
- STL
1 stop6h 31m
Delta
Deal found 6/11![Delta logo]()
$264
This Delta deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:45 pm
ORD
- BIL
1 stop5h 45m
Delta
Wed 8/195:20 am
BIL
- ORD
1 stop5h 39m
Delta
Deal found 6/16![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:32 am
STL
- BZN
2 stops12h 05m
American Airlines
Sat 9/56:26 am
BZN
- STL
1 stop8h 48m
American Airlines
Deal found 6/13![American Airlines logo]()
$276
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/257:45 pm
STL
- BZN
1 stop5h 19m
Delta
Thu 9/31:00 pm
BZN
- STL
1 stop4h 55m
Delta
Deal found 6/11![Delta logo]()
$278
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/306:20 am
STL
- BZN
1 stop5h 01m
Delta
Thu 9/31:00 pm
BZN
- STL
1 stop4h 55m
Delta
Deal found 6/11![Delta logo]()
$285
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/410:09 am
ORD
- BZN
Nonstop3h 25m
American Airlines
Fri 8/144:15 pm
BZN
- ORD
1 stop7h 03m
American Airlines
Deal found 6/11![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:50 pm
MDW
- BZN
1 stop5h 10m
Southwest
Fri 8/2112:20 pm
BZN
- MDW
Nonstop2h 55m
Southwest
Deal found 6/13![Southwest logo]()
$295
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/137:00 am
ORD
- BZN
1 stop8h 34m
Delta
Sat 8/226:00 am
BZN
- ORD
1 stop4h 59m
Delta
Deal found 6/11![Delta logo]()
$297
Best flights from Illinois to MontanaDiscover carefully curated flight deals from Illinois to Montana that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
Discover carefully curated flight deals from Illinois to Montana that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
This Delta deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:34 pm
STL
- BZN
1 stop6h 42m
Delta
Sat 9/56:19 am
BZN
- STL
1 stop7h 28m
Delta
Deal found 6/16![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/265:00 am
ORD
- BZN
1 stop5h 29m
United Airlines
Thu 7/305:51 pm
BZN
- ORD
1 stop5h 53m
United Airlines
Deal found 6/15![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/247:45 pm
STL
- BZN
1 stop6h 30m
Southwest
Tue 7/286:40 am
BZN
- STL
1 stop4h 55m
Southwest
Deal found 6/12![Southwest logo]()
$353
This Sun Country Air deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:05 pm
ORD
- FCA
1 stop16h 13m
Sun Country Air
Fri 7/173:47 pm
FCA
- ORD
1 stop25h 17m
Sun Country Air
Deal found 6/16![Sun Country Air logo]()
$365
This American Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:00 am
ORD
- FCA
1 stop7h 36m
American Airlines
Sun 8/304:50 pm
FCA
- ORD
Nonstop3h 49m
American Airlines
Deal found 6/16![American Airlines logo]()
$378
This Alaska Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/274:40 pm
STL
- FCA
1 stop7h 19m
Alaska Airlines
Sat 10/312:03 pm
FCA
- STL
1 stop8h 56m
Alaska Airlines
Deal found 6/16![Alaska Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:34 pm
STL
- BZN
1 stop6h 42m
Delta
Sat 8/156:19 am
BZN
- STL
1 stop7h 28m
Delta
Deal found 6/13![Delta logo]()
$315
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:40 am
ORD
- FCA
Nonstop3h 47m
United Airlines
Sat 8/295:04 pm
FCA
- ORD
1 stop5h 55m
United Airlines
Deal found 6/15![United Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:48 am
ORD
- GTF
1 stop5h 40m
Delta
Sat 9/121:10 pm
GTF
- ORD
1 stop7h 48m
Delta
Deal found 6/12![Delta logo]()
$318
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/45:10 am
STL
- BZN
1 stop5h 27m
United Airlines
Tue 7/74:29 pm
BZN
- STL
1 stop6h 28m
United Airlines
Deal found 6/14![United Airlines logo]()
$323
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:28 am
ORD
- GTF
2 stops10h 14m
Delta
Tue 9/151:15 pm
GTF
- ORD
1 stop7h 32m
Delta
Deal found 6/12![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/114:50 pm
MDW
- BZN
1 stop7h 05m
Southwest
Wed 7/157:00 pm
BZN
- MDW
1 stop9h 25m
Southwest
Deal found 6/13![Southwest logo]()
$405
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:00 am
STL
- BZN
2 stops8h 30m
United Airlines
Sat 9/52:30 pm
BZN
- STL
1 stop5h 16m
United Airlines
Deal found 6/12![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:30 am
ORD
- MSO
1 stop6h 06m
Delta
Sun 11/85:40 am
MSO
- ORD
1 stop5h 45m
Delta
Deal found 6/12![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/272:17 pm
ORD
- MSO
2 stops9h 34m
Alaska Airlines
Wed 10/282:06 pm
MSO
- ORD
1 stop8h 53m
Alaska Airlines
Deal found 6/14![Alaska Airlines logo]()
$445
This Sun Country Air deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/246:19 pm
ORD
- FCA
1 stop16h 51m
Sun Country Air
Sun 7/2610:17 am
FCA
- ORD
1 stop6h 22m
Sun Country Air
Deal found 6/15![Sun Country Air logo]()
$455
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/33:20 pm
STL
- BZN
2 stops10h 50m
Southwest
Fri 7/1010:15 am
BZN
- STL
2 stops9h 45m
Southwest
Deal found 6/11![Southwest logo]()
$429
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:00 am
STL
- BZN
1 stop7h 30m
United Airlines
Thu 8/272:30 pm
BZN
- STL
1 stop5h 16m
United Airlines
Deal found 6/15![United Airlines logo]()
$361
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:25 pm
MDW
- MSO
1 stop5h 22m
Delta
Tue 9/85:45 am
MSO
- MDW
1 stop6h 26m
Delta
Deal found 6/12![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/292:22 pm
ORD
- MSO
2 stops9h 34m
Alaska Airlines
Sat 10/33:46 pm
MSO
- ORD
1 stop7h 13m
Alaska Airlines
Deal found 6/12![Alaska Airlines logo]()
$445
This Southwest deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1111:00 am
MDW
- BZN
Nonstop3h 10m
Southwest
Tue 7/147:00 pm
BZN
- MDW
1 stop9h 25m
Southwest
Deal found 6/15![Southwest logo]()
$435
This Delta deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1812:46 pm
ORD
- BZN
1 stop7h 58m
Delta
Mon 7/2011:29 am
BZN
- ORD
1 stop7h 01m
Delta
Deal found 6/15![Delta logo]()
$332
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:51 pm
ORD
- BIL
1 stop6h 00m
United Airlines
Mon 8/242:29 pm
BIL
- ORD
1 stop6h 00m
United Airlines
Deal found 6/12![United Airlines logo]()
$375
This Alaska Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/122:22 pm
ORD
- MSO
2 stops9h 39m
Alaska Airlines
Sat 9/197:00 am
MSO
- ORD
1 stop7h 07m
Alaska Airlines
Deal found 6/14![Alaska Airlines logo]()
$470
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/172:00 pm
ORD
- MSO
2 stops10h 37m
Delta
Sun 9/276:00 am
MSO
- ORD
1 stop4h 49m
Delta
Deal found 6/14![Delta logo]()
$334
This Southwest deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/49:25 am
STL
- BZN
2 stops10h 05m
Southwest
Tue 7/77:45 am
BZN
- STL
2 stops8h 55m
Southwest
Deal found 6/14![Southwest logo]()
$449
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Thu 7/234:24 pm
BZN
- ORD
Nonstop3h 16m
United Airlines
Deal found 6/16![United Airlines logo]()
$376
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:44 pm
ORD
- BIL
2 stops10h 46m
Delta
Mon 8/246:26 am
BIL
- ORD
1 stop7h 35m
Delta
Deal found 6/12![Delta logo]()
$338
This Southwest deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:45 pm
STL
- BZN
1 stop6h 30m
Southwest
Fri 7/314:30 pm
BZN
- STL
1 stop5h 15m
Southwest
Deal found 6/14![Southwest logo]()
$459
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/45:00 am
ORD
- BZN
1 stop5h 37m
United Airlines
Sat 8/84:20 pm
BZN
- ORD
1 stop7h 24m
United Airlines
Deal found 6/15![United Airlines logo]()
$386
Last-minute flights from Illinois to MontanaDiscover last-minute flight deals from Illinois to Montana. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Montana. Data last updated June 16, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:38 am
STL
- BZN
1 stop7h 44m
American Airlines
Tue 7/145:03 pm
BZN
- STL
1 stop6h 13m
American Airlines
Deal found 6/13![American Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/137:40 pm
ORD
- BZN
1 stop5h 43m
Delta
Wed 7/223:54 pm
BZN
- ORD
1 stop6h 44m
Delta
Deal found 6/12![Delta logo]()
$305
This United Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/138:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Mon 7/208:00 am
BZN
- ORD
Nonstop2h 59m
United Airlines
Deal found 6/13![United Airlines logo]()
$311
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/139:10 am
ORD
- BZN
Nonstop3h 34m
United Airlines
Fri 7/174:29 pm
BZN
- ORD
1 stop5h 50m
United Airlines
Deal found 6/12![United Airlines logo]()
$314
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/148:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Tue 7/214:29 pm
BZN
- ORD
1 stop7h 15m
United Airlines
Deal found 6/14![United Airlines logo]()
$321
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:49 pm
ORD
- BZN
Nonstop3h 24m
American Airlines
Wed 7/225:03 pm
BZN
- ORD
Nonstop3h 27m
American Airlines
Deal found 6/13![American Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/212:02 pm
ORD
- BZN
2 stops9h 47m
Delta
Tue 7/2812:13 pm
BZN
- ORD
1 stop5h 44m
Delta
Deal found 6/14![Delta logo]()
$310
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/258:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Tue 7/284:29 pm
BZN
- ORD
1 stop7h 15m
United Airlines
Deal found 6/11![United Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/255:00 am
ORD
- BIL
1 stop5h 35m
United Airlines
Thu 7/304:10 pm
BIL
- ORD
1 stop7h 34m
United Airlines
Deal found 6/15![United Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/265:00 am
MDW
- BZN
1 stop7h 30m
Southwest
Fri 7/311:50 pm
BZN
- MDW
1 stop8h 40m
Southwest
Deal found 6/15![Southwest logo]()
$305
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/265:00 am
ORD
- BZN
1 stop5h 29m
United Airlines
Sat 8/14:20 pm
BZN
- ORD
1 stop5h 29m
United Airlines
Deal found 6/11![United Airlines logo]()
$320
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/281:25 pm
ORD
- BZN
1 stop8h 14m
American Airlines
Fri 7/315:03 pm
BZN
- ORD
Nonstop3h 27m
American Airlines
Deal found 6/12![American Airlines logo]()
$295
One-way flights from Illinois to MontanaSearch for one-way flight options from Illinois to Montana. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
Search for one-way flight options from Illinois to Montana. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/117:44 pm
ORD
- BZN
1 stop5h 20m
Delta
Deal found 6/11![Delta logo]()
$109
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 9/911:30 am
ORD
- BZN
2 stops13h 29m
Delta
Deal found 6/11![Delta logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:57 pm
ORD
- MSO
2 stops36h 37m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$130
This Delta deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:45 pm
STL
- BZN
1 stop5h 19m
Delta
Deal found 6/16![Delta logo]()
$136
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/88:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Deal found 6/11![United Airlines logo]()
$139
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:32 am
STL
- BZN
2 stops12h 05m
American Airlines
Deal found 6/12![American Airlines logo]()
$141
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:10 pm
ORD
- BZN
Nonstop3h 12m
American Airlines
Deal found 6/12![American Airlines logo]()
$143
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:45 am
ORD
- BZN
Nonstop3h 20m
American Airlines
Deal found 6/12![American Airlines logo]()
$144
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/137:25 pm
MDW
- BZN
1 stop4h 51m
Delta
Deal found 6/11![Delta logo]()
$149
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/177:40 pm
ORD
- BZN
1 stop5h 43m
Delta
Deal found 6/11![Delta logo]()
$153
This Delta deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:25 pm
MDW
- BZN
1 stop4h 51m
Delta
Deal found 6/16![Delta logo]()
$153
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/105:57 pm
ORD
- BZN
2 stops7h 07m
Delta
Deal found 6/11![Delta logo]()
$154
Find flight deals from Illinois to Montana
Keep the following information in mind while searching for Illinois to Montana flight deals. Data was last updated June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $224 (Kiwi.com) |
One-way from | $109 (Delta) |
Popular in | March |
Cheapest in | April |
Average price | $329 |
Good round-trip deal | $369 or less |
Good one-way deal | $179 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Montana 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 June 16, 2026.
Use the filters below to find and compare flights from Illinois to Montana that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Tue 9/1
5:34 pm-11:16 pm
1 stop6h 42m
Bozeman Gallatin Field
Sat 9/5
6:19 am-2:47 pm
1 stop7h 28m
$271
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Sun 7/26
5:00 am-9:29 am
1 stop5h 29m
Bozeman Gallatin Field
Thu 7/30
5:51 pm-12:44 am
1 stop5h 53m
$305
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Mon 8/10
5:34 pm-11:16 pm
1 stop6h 42m
Bozeman Gallatin Field
Sat 8/15
6:19 am-2:47 pm
1 stop7h 28m
$315
ChicagoGreat Falls
ORD - GTF
ORDGTF
Chicago O'Hare Intl
Sun 9/6
7:48 am-12:28 pm
1 stop5h 40m
Great Falls
Sat 9/12
1:10 pm-9:58 pm
1 stop7h 48m
$318
ChicagoKalispell
ORD - FCA
ORDFCA
Chicago O'Hare Intl
Tue 8/25
8:40 am-11:27 am
Nonstop3h 47m
Kalispell Glacier Park
Sat 8/29
5:04 pm-11:59 pm
1 stop5h 55m
$319
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Sat 7/4
5:10 am-9:37 am
1 stop5h 27m
Bozeman Gallatin Field
Tue 7/7
4:29 pm-11:57 pm
1 stop6h 28m
$323
ChicagoGreat Falls
ORD - GTF
ORDGTF
Chicago O'Hare Intl
Fri 9/4
8:28 am-5:42 pm
2 stops10h 14m
Great Falls
Tue 9/15
1:15 pm-9:47 pm
1 stop7h 32m
$324
ChicagoMissoula
ORD - MSO
ORDMSO
Chicago O'Hare Intl
Thu 11/5
7:30 am-12:36 pm
1 stop6h 06m
Missoula Johnson-Bell Field
Sun 11/8
5:40 am-12:25 pm
1 stop5h 45m
$329
ChicagoMissoula
MDW - MSO
MDWMSO
Chicago Midway
Thu 9/3
7:25 pm-11:47 pm
1 stop5h 22m
Missoula Johnson-Bell Field
Tue 9/8
5:45 am-1:11 pm
1 stop6h 26m
$329
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Sat 7/18
12:46 pm-7:44 pm
1 stop7h 58m
Bozeman Gallatin Field
Mon 7/20
11:29 am-7:30 pm
1 stop7h 01m
$332
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Montana
Have a flexible travel schedule? Discover the best time to fly to Montana from Illinois with our price prediction graph.
STL-BZN
ORD-BZN
MDW-BZN
ORD-MSO
ORD-FCA
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 Illinois to Montana
USIL-USMT
STL-BZN
ORD-BZN
MDW-BZN
ORD-MSO
What is the cheapest month to book a flight from Illinois to Montana?
Currently, October is the cheapest month in which you can book a flight from Illinois to Montana (average of $133). Flying from Illinois to Montana in July is currently the most expensive (average of $692). 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 IL to MT?
Find hourly flight availability from Illinois to Montana. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 16, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 31% on flights from Illinois to Montana by exploring options for tickets in the afternoon.
Weekly flight availability from Illinois to Montana
Explore weekly flight availability from Illinois to Montana. 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 June 16, 2026.
The most flights from USIL to USMT are scheduled on a Monday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Illinois to Montana?
How far ahead should I book a flight from Illinois to Montana?
The price you pay for your flight from Illinois to Montana may vary depending on when you book. For the best chance of a lower fare, look to book 60 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Illinois to Montana?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Montana. Price data was last updated on June 13, 2026.
Travelers seeking maximum savings on their Illinois to Montana flight should consider departing on Monday evenings when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Montana
Get insights into the airlines that provide service to Montana. 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 Montana. Reviews last updated June 16, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andDelta from Illinois to Montana. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Related info for your journey
Find useful and relevant information for your journey from Illinois to Montana. 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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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Illinois to Montana
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Montana by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Montana by cabin class
Find flights from Illinois to Montana, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Montana flights
Browse other Illinois and Montana flight options. Last updated on June 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Montana
Find the right flight back to Illinois after your stay in Montana
Illinois to Montana flights
Consider these flights traveling from Illinois to Montana.
Top 5 airlines flying from Illinois to Montana
Discover the top 5 airlines that operate flights from Illinois to Montana. 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$210 | Average$440 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$216 | Average$364 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$401 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$226 | Average$513 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$232 | Average$433 | FlexibilityNo cancel fee | On-time69% |