$125+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Apr 15 — Apr 221
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Montana with Cheapflights
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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 March 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 March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Mon 4/136:00 am
ORD
- BZN
1 stop9h 10m
Alaska Airlines
Sat 4/187:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 8/228:40 am
ORD
- BIL
Nonstop3h 22m
United Airlines
Wed 8/2611:43 am
BIL
- ORD
Nonstop3h 05m
United Airlines
Deal found 3/12![United Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 3/12. 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 4/106:45 pm
STL
- BZN
1 stop5h 15m
Southwest
Fri 4/174:20 pm
BZN
- STL
1 stop6h 30m
Southwest
Deal found 3/12![Southwest logo]()
$251
This Southwest deal was found by Cheapflights users on 3/11. 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 4/311:30 am
STL
- BZN
2 stops8h 00m
Southwest
Tue 4/79:55 am
BZN
- STL
1 stop9h 15m
Southwest
Deal found 3/11![Southwest logo]()
$256
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:00 am
ORD
- BZN
1 stop11h 46m
Alaska Airlines
Sat 4/187:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 3/12. 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.
Tue 5/267:59 pm
STL
- BZN
1 stop5h 00m
Delta
Wed 6/31:12 pm
BZN
- STL
1 stop4h 51m
Delta
Deal found 3/12![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 3/11. 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 9/199:40 am
ORD
- BIL
Nonstop3h 05m
American Airlines
Thu 9/2412:17 pm
BIL
- ORD
Nonstop2h 53m
American Airlines
Deal found 3/11![American Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 8/228:40 am
ORD
- BIL
Nonstop3h 22m
United Airlines
Tue 8/252:25 pm
BIL
- ORD
1 stop7h 16m
United Airlines
Deal found 3/12![United Airlines logo]()
$261
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
ORD
- BZN
1 stop13h 46m
Alaska Airlines
Tue 4/2111:20 am
BZN
- ORD
1 stop11h 39m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$265
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:36 pm
ORD
- BZN
Nonstop3h 14m
American Airlines
Tue 8/254:54 pm
BZN
- ORD
Nonstop3h 09m
American Airlines
Deal found 3/14![American Airlines logo]()
$268
This American Airlines deal was found by Cheapflights users on 3/13. 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 5/271:44 pm
ORD
- BZN
Nonstop3h 18m
American Airlines
Wed 6/31:22 pm
BZN
- ORD
Nonstop3h 25m
American Airlines
Deal found 3/13![American Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 3/12. 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 4/95:00 am
ORD
- BIL
1 stop9h 21m
American Airlines
Thu 4/161:51 pm
BIL
- ORD
1 stop8h 57m
American Airlines
Deal found 3/12![American Airlines logo]()
$269
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 March 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 March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:00 am
ORD
- BZN
1 stop11h 46m
Alaska Airlines
Sat 4/187:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 3/12. 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.
Sat 5/22:12 pm
MDW
- BIL
1 stop6h 54m
Delta
Tue 5/56:24 am
BIL
- MDW
1 stop6h 08m
Delta
Deal found 3/12![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:46 pm
ORD
- BIL
Nonstop3h 13m
American Airlines
Sun 8/306:00 am
BIL
- ORD
Nonstop2h 51m
American Airlines
Deal found 3/15![American Airlines logo]()
$301
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 4/112:00 pm
ORD
- FCA
1 stop8h 47m
United Airlines
Sat 4/182:33 pm
FCA
- ORD
1 stop7h 25m
United Airlines
Deal found 3/12![United Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 3/14. 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.
Fri 4/245:15 pm
MDW
- BZN
1 stop6h 45m
Southwest
Mon 4/2710:55 am
BZN
- MDW
2 stops9h 05m
Southwest
Deal found 3/14![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:00 am
ORD
- BZN
1 stop14h 19m
Alaska Airlines
Tue 5/57:59 pm
BZN
- ORD
1 stop9h 41m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 3/11. 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 5/267:59 pm
STL
- BZN
1 stop5h 00m
Delta
Wed 6/31:12 pm
BZN
- STL
1 stop4h 51m
Delta
Deal found 3/11![Delta logo]()
$277
This Sun Country Air deal was found by Cheapflights users on 3/12. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/244:55 pm
ORD
- FCA
1 stop18h 15m
Sun Country Air
Sun 7/2610:25 am
FCA
- ORD
1 stop6h 14m
Sun Country Air
Deal found 3/12![Sun Country Air logo]()
$627
This Delta deal was found by Cheapflights users on 3/11. 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 4/142:12 pm
MDW
- BZN
1 stop6h 59m
Delta
Sat 4/185:30 am
BZN
- MDW
2 stops7h 02m
Delta
Deal found 3/11![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 3/11. 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 4/152:12 pm
MDW
- BZN
1 stop6h 59m
Delta
Tue 4/215:30 am
BZN
- MDW
2 stops7h 02m
Delta
Deal found 3/11![Delta logo]()
$294
This Southwest deal was found by Cheapflights users on 3/12. 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 4/106:45 pm
STL
- BZN
1 stop5h 15m
Southwest
Fri 4/1710:55 am
BZN
- STL
2 stops9h 00m
Southwest
Deal found 3/12![Southwest logo]()
$356
This Alaska Airlines deal was found by Cheapflights users on 3/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/73:50 pm
STL
- BZN
1 stop9h 07m
Alaska Airlines
Wed 4/87:00 am
BZN
- STL
1 stop6h 51m
Alaska Airlines
Deal found 3/13![Alaska Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Wed 4/159:05 am
ORD
- BZN
Nonstop3h 26m
United Airlines
Tue 4/212:40 pm
BZN
- ORD
1 stop5h 40m
United Airlines
Deal found 3/11![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Tue 6/305:00 am
ORD
- BZN
1 stop5h 37m
United Airlines
Thu 7/24:20 pm
BZN
- ORD
Nonstop3h 15m
United Airlines
Deal found 3/11![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 3/14. 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.
Wed 5/277:13 pm
MDW
- BIL
1 stop5h 01m
Delta
Mon 6/16:30 am
BIL
- MDW
1 stop5h 49m
Delta
Deal found 3/14![Delta logo]()
$300
This Southwest deal was found by Cheapflights users on 3/15. 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.
Thu 4/97:20 am
STL
- BZN
2 stops9h 20m
Southwest
Mon 4/134:20 pm
BZN
- STL
1 stop6h 30m
Southwest
Deal found 3/15![Southwest logo]()
$370
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 6/206:00 am
ORD
- BZN
1 stop8h 20m
United Airlines
Sat 6/278:00 am
BZN
- ORD
Nonstop3h 05m
United Airlines
Deal found 3/12![United Airlines logo]()
$365
This Delta deal was found by Cheapflights users on 3/12. 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.
Sat 8/221:35 pm
ORD
- BIL
2 stops9h 52m
Delta
Tue 8/255:45 am
BIL
- ORD
1 stop5h 36m
Delta
Deal found 3/12![Delta logo]()
$305
This Southwest deal was found by Cheapflights users on 3/15. 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.
Thu 7/24:55 pm
MDW
- BZN
1 stop9h 15m
Southwest
Tue 7/77:05 pm
BZN
- MDW
1 stop9h 20m
Southwest
Deal found 3/15![Southwest logo]()
$381
This Alaska Airlines deal was found by Cheapflights users on 3/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/102:09 pm
ORD
- FCA
1 stop24h 03m
Alaska Airlines
Mon 4/138:26 pm
FCA
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 3/15![Alaska Airlines logo]()
$394
This Delta deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:12 pm
STL
- BZN
1 stop5h 58m
Delta
Mon 4/136:34 pm
BZN
- STL
1 stop4h 51m
Delta
Deal found 3/15![Delta logo]()
$308
This United Airlines deal was found by Cheapflights users on 3/14. 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 8/222:33 pm
ORD
- FCA
1 stop7h 59m
United Airlines
Tue 8/254:08 pm
FCA
- ORD
Nonstop3h 42m
United Airlines
Deal found 3/14![United Airlines logo]()
$380
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 3/287:09 pm
ORD
- BZN
Nonstop3h 29m
Alaska Airlines
Tue 3/317:00 am
BZN
- ORD
Nonstop3h 11m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 3/11. 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 9/46:15 am
MDW
- BZN
1 stop9h 35m
Southwest
Fri 9/1812:20 pm
BZN
- MDW
Nonstop2h 55m
Southwest
Deal found 3/11![Southwest logo]()
$402
This Delta deal was found by Cheapflights users on 3/14. 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 5/282:00 pm
ORD
- BIL
2 stops9h 52m
Delta
Mon 6/15:30 am
BIL
- ORD
1 stop5h 22m
Delta
Deal found 3/14![Delta logo]()
$314
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Wed 7/227:05 am
ORD
- MSO
1 stop7h 14m
United Airlines
Mon 7/275:20 pm
MSO
- ORD
1 stop6h 24m
United Airlines
Deal found 3/11![United Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 3/14. 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.
Fri 6/267:45 pm
STL
- BZN
1 stop6h 25m
Southwest
Sat 7/47:00 am
BZN
- STL
2 stops10h 00m
Southwest
Deal found 3/14![Southwest logo]()
$404
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Thu 6/46:00 am
ORD
- MSO
1 stop8h 24m
United Airlines
Thu 6/115:20 pm
MSO
- ORD
1 stop6h 24m
United Airlines
Deal found 3/12![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 3/12. 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.
Sat 8/226:45 pm
MDW
- BIL
1 stop4h 52m
Delta
Wed 8/266:15 am
BIL
- MDW
1 stop5h 52m
Delta
Deal found 3/12![Delta logo]()
$325
This Southwest deal was found by Cheapflights users on 3/15. 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.
Fri 5/86:45 pm
STL
- BZN
1 stop5h 15m
Southwest
Sun 5/105:25 am
BZN
- STL
2 stops8h 30m
Southwest
Deal found 3/15![Southwest logo]()
$405
Last-minute flights from Illinois to MontanaDiscover last-minute flight deals from Illinois to Montana. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Montana. Data last updated March 16, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 3/11. 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 4/16:12 pm
STL
- BZN
1 stop5h 58m
Delta
Wed 4/85:20 am
BZN
- STL
1 stop6h 57m
Delta
Deal found 3/11![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 3/11. 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 4/311:30 am
STL
- BZN
2 stops8h 00m
Southwest
Tue 4/79:55 am
BZN
- STL
1 stop9h 15m
Southwest
Deal found 3/11![Southwest logo]()
$256
This United Airlines deal was found by Cheapflights users on 3/12. 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 4/37:45 pm
ORD
- BZN
Nonstop3h 25m
United Airlines
Tue 4/74:19 pm
BZN
- ORD
1 stop7h 11m
United Airlines
Deal found 3/12![United Airlines logo]()
$279
This American Airlines deal was found by Cheapflights users on 3/12. 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 4/95:00 am
ORD
- BIL
1 stop9h 21m
American Airlines
Thu 4/161:51 pm
BIL
- ORD
1 stop8h 57m
American Airlines
Deal found 3/12![American Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 3/12. 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 4/106:45 pm
STL
- BZN
1 stop5h 15m
Southwest
Fri 4/174:20 pm
BZN
- STL
1 stop6h 30m
Southwest
Deal found 3/12![Southwest logo]()
$251
This United Airlines deal was found by Cheapflights users on 3/12. 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 4/109:05 am
ORD
- BZN
Nonstop3h 24m
United Airlines
Fri 4/172:40 pm
BZN
- ORD
1 stop7h 14m
United Airlines
Deal found 3/12![United Airlines logo]()
$275
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Mon 4/136:00 am
ORD
- BZN
1 stop9h 10m
Alaska Airlines
Sat 4/187:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:00 am
ORD
- BZN
1 stop11h 46m
Alaska Airlines
Sat 4/187:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
ORD
- BZN
1 stop13h 46m
Alaska Airlines
Tue 4/2111:20 am
BZN
- ORD
1 stop11h 39m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$265
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 4/182:00 pm
ORD
- BIL
1 stop7h 57m
United Airlines
Tue 4/212:35 pm
BIL
- ORD
1 stop5h 45m
United Airlines
Deal found 3/12![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 3/12. 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.
Sat 4/1811:19 am
ORD
- BIL
2 stops12h 05m
Delta
Tue 4/215:20 am
BIL
- ORD
1 stop5h 31m
Delta
Deal found 3/12![Delta logo]()
$276
This Orbitz deal was found by Cheapflights users on 3/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:00 am
ORD
- BZN
1 stop7h 55m
Alaska Airlines
Sun 4/263:36 pm
BZN
- ORD
1 stop20h 37m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$277
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 March 16, 2026.
Search for one-way flight options from Illinois to Montana. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Thu 4/96:00 am
ORD
- BZN
1 stop9h 10m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$125
This Delta deal was found by Cheapflights users on 3/11. 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 4/73:59 pm
ORD
- BIL
1 stop5h 20m
Delta
Deal found 3/11![Delta logo]()
$125
This American Airlines deal was found by Cheapflights users on 3/11. 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.
Thu 4/305:20 am
STL
- BZN
1 stop8h 33m
American Airlines
Deal found 3/11![American Airlines logo]()
$126
This Trip.com deal was found by Cheapflights users on 3/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:00 am
ORD
- BZN
1 stop9h 10m
Hawaiian Airlines
Deal found 3/13![Hawaiian Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:36 pm
ORD
- BZN
2 stops17h 59m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$128
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Sat 4/189:16 am
STL
- BZN
2 stops13h 16m
United Airlines
Deal found 3/13![United Airlines logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/282:15 pm
MDW
- BZN
2 stops44h 20m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$134
This American Airlines deal was found by Cheapflights users on 3/13. 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 5/271:44 pm
ORD
- BZN
Nonstop3h 18m
American Airlines
Deal found 3/13![American Airlines logo]()
$135
This American Airlines deal was found by Cheapflights users on 3/11. 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.
Thu 7/91:49 pm
ORD
- BZN
Nonstop3h 19m
American Airlines
Deal found 3/11![American Airlines logo]()
$136
This United Airlines deal was found by Cheapflights users on 3/15. 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 5/305:10 am
STL
- BZN
1 stop5h 27m
United Airlines
Deal found 3/15![United Airlines logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Sat 5/98:52 pm
ORD
- BZN
1 stop13h 43m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:10 am
MDW
- BZN
2 stops28h 25m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$137
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 March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $249 (Alaska Airlines) |
One-way from | $125 (Alaska Airlines) |
Popular in | March |
Cheapest in | September |
Average price | $379 |
Good round-trip deal | $286 or less |
Good one-way deal | $164 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 March 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
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Tue 4/14
8:00 am-6:46 pm
1 stop11h 46m
Bozeman Gallatin Field
Sat 4/18
7:26 pm-6:39 am
1 stop10h 13m
$257
ChicagoBillings
MDW - BIL
MDWBIL
Chicago Midway
Sat 5/2
2:12 pm-8:06 pm
1 stop6h 54m
Billings Logan Intl
Tue 5/5
6:24 am-1:32 pm
1 stop6h 08m
$271
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Sat 5/2
6:00 am-7:19 pm
1 stop14h 19m
Bozeman Gallatin Field
Tue 5/5
7:59 pm-6:40 am
1 stop9h 41m
$277
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Tue 5/26
7:59 pm-11:59 pm
1 stop5h 00m
Bozeman Gallatin Field
Wed 6/3
1:12 pm-7:03 pm
1 stop4h 51m
$277
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Tue 4/14
2:12 pm-8:11 pm
1 stop6h 59m
Bozeman Gallatin Field
Sat 4/18
5:30 am-1:32 pm
2 stops7h 02m
$294
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Wed 4/15
2:12 pm-8:11 pm
1 stop6h 59m
Bozeman Gallatin Field
Tue 4/21
5:30 am-1:32 pm
2 stops7h 02m
$294
ChicagoBillings
MDW - BIL
MDWBIL
Chicago Midway
Wed 5/27
7:13 pm-11:14 pm
1 stop5h 01m
Billings Logan Intl
Mon 6/1
6:30 am-1:19 pm
1 stop5h 49m
$300
Quickest round-trip
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Thu 8/27
8:46 pm-10:59 pm
Nonstop3h 13m
Billings Logan Intl
Sun 8/30
6:00 am-9:51 am
Nonstop2h 51m
$301
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Sat 8/22
1:35 pm-10:27 pm
2 stops9h 52m
Billings Logan Intl
Tue 8/25
5:45 am-12:21 pm
1 stop5h 36m
$305
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Thu 4/9
6:12 pm-11:10 pm
1 stop5h 58m
Bozeman Gallatin Field
Mon 4/13
6:34 pm-12:25 am
1 stop4h 51m
$308
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.
ORD-BZN
STL-BZN
ORD-BIL
STL-FCA
ORD-MSO
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
ORD-BZN
STL-BZN
ORD-BIL
STL-FCA
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 $190). Flying from Illinois to Montana in December is currently the most expensive (average of $281). 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 March 16, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 23% on flights from Illinois to Montana by exploring options for tickets in the afternoon.
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 March 14, 2026.
Travelers seeking maximum savings on their Illinois to Montana flight should consider departing on Monday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 March 16, 2026.
The most flights from USIL to USMT are scheduled on a Monday (8 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).
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 March 16, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, 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
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Entertainment
7.5
Boarding
8.1
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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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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 March 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 March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$169 | Average$378 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$210 | Average$402 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$210 | Average$420 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$230 | Average$495 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$291 | Average$552 | FlexibilityNo cancel fee | On-time75% |