$138+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Sep 3 — Sep 101
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 August 4, 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 August 4, 2026.
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:56 pm
ORD
- BIL
1 stop6h 04m
United Airlines
Sat 9/1211:43 am
BIL
- ORD
Nonstop3h 05m
United Airlines
Deal found 8/3![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/96:24 pm
ORD
- BIL
1 stop5h 51m
Delta
Sat 9/125:20 am
BIL
- ORD
1 stop5h 35m
Delta
Deal found 7/31![Delta logo]()
$281
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:26 pm
ORD
- BIL
1 stop5h 34m
United Airlines
Tue 9/82:29 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Deal found 8/2![United Airlines logo]()
$294
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:48 pm
ORD
- BIL
1 stop5h 42m
United Airlines
Wed 11/47:00 am
BIL
- ORD
1 stop6h 55m
United Airlines
Deal found 7/30![United Airlines logo]()
$301
This SmartFares deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:00 am
ORD
- MSO
1 stop8h 17m
Alaska Airlines
Wed 9/234:16 pm
MSO
- ORD
1 stop6h 43m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:30 pm
ORD
- BIL
1 stop5h 45m
Delta
Thu 11/56:01 am
BIL
- ORD
1 stop4h 38m
Delta
Deal found 8/3![Delta logo]()
$312
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:35 am
ORD
- BZN
1 stop5h 32m
Delta
Sat 10/171:12 pm
BZN
- ORD
1 stop7h 48m
Delta
Deal found 8/3![Delta logo]()
$315
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/145:30 pm
MDW
- BZN
1 stop7h 15m
Southwest
Mon 9/212:30 pm
BZN
- MDW
1 stop8h 20m
Southwest
Deal found 7/31![Southwest logo]()
$315
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:45 pm
ORD
- BZN
Nonstop3h 27m
United Airlines
Sun 10/1812:53 pm
BZN
- ORD
Nonstop3h 07m
United Airlines
Deal found 8/1![United Airlines logo]()
$316
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/249:00 am
STL
- FCA
1 stop5h 28m
United Airlines
Wed 10/282:36 pm
FCA
- STL
1 stop5h 23m
United Airlines
Deal found 7/30![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:45 am
ORD
- FCA
Nonstop3h 59m
American Airlines
Sat 10/31:34 pm
FCA
- ORD
Nonstop3h 44m
American Airlines
Deal found 7/30![American Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/299:40 am
ORD
- MSO
Nonstop3h 55m
American Airlines
Sun 11/11:10 pm
MSO
- ORD
Nonstop3h 43m
American Airlines
Deal found 7/30![American Airlines logo]()
$319
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 August 4, 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 August 4, 2026.
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:48 pm
ORD
- BIL
1 stop5h 42m
United Airlines
Wed 11/47:00 am
BIL
- ORD
1 stop6h 55m
United Airlines
Deal found 8/1![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:44 am
ORD
- BIL
2 stops12h 41m
Delta
Wed 11/412:58 pm
BIL
- ORD
1 stop8h 02m
Delta
Deal found 8/1![Delta logo]()
$286
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:15 am
MDW
- BZN
1 stop9h 35m
Southwest
Thu 10/16:15 pm
BZN
- MDW
1 stop10h 25m
Southwest
Deal found 8/3![Southwest logo]()
$320
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:00 am
ORD
- MSO
1 stop8h 17m
Alaska Airlines
Sat 9/194:16 pm
MSO
- ORD
1 stop6h 43m
Alaska Airlines
Deal found 8/3![Alaska Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:32 am
STL
- FCA
1 stop7h 38m
American Airlines
Sun 8/304:50 pm
FCA
- STL
1 stop19h 04m
American Airlines
Deal found 8/3![American Airlines logo]()
$504
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:00 am
ORD
- BZN
1 stop8h 54m
Delta
Tue 10/138:25 am
BZN
- ORD
1 stop7h 28m
Delta
Deal found 7/31![Delta logo]()
$315
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/92:32 pm
ORD
- BIL
1 stop7h 28m
United Airlines
Sat 9/1211:43 am
BIL
- ORD
Nonstop3h 05m
United Airlines
Deal found 8/4![United Airlines logo]()
$320
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/17:35 am
ORD
- BIL
1 stop5h 43m
Delta
Sat 11/712:58 pm
BIL
- ORD
2 stops7h 38m
Delta
Deal found 8/3![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/154:40 pm
MDW
- BZN
2 stops6h 50m
Southwest
Tue 9/226:55 am
BZN
- MDW
2 stops12h 55m
Southwest
Deal found 8/2![Southwest logo]()
$362
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:01 pm
ORD
- BZN
Nonstop3h 22m
United Airlines
Sat 9/54:30 pm
BZN
- ORD
Nonstop3h 07m
United Airlines
Deal found 8/3![United Airlines logo]()
$345
This Alaska Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:08 pm
STL
- BZN
1 stop20h 16m
Alaska Airlines
Tue 9/222:21 pm
BZN
- STL
1 stop23h 00m
Alaska Airlines
Deal found 8/4![Alaska Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:44 am
ORD
- BIL
2 stops12h 41m
Delta
Thu 11/56:01 am
BIL
- ORD
1 stop4h 38m
Delta
Deal found 8/3![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/110:05 am
MDW
- BZN
Nonstop3h 10m
Southwest
Sat 9/57:10 am
BZN
- MDW
Nonstop2h 55m
Southwest
Deal found 8/3![Southwest logo]()
$374
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/295:00 pm
STL
- FCA
1 stop6h 53m
Delta
Wed 9/26:20 am
FCA
- STL
1 stop7h 50m
Delta
Deal found 7/31![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:56 pm
ORD
- GTF
1 stop6h 16m
United Airlines
Tue 9/82:25 pm
GTF
- ORD
1 stop7h 21m
United Airlines
Deal found 8/2![United Airlines logo]()
$355
This Alaska Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:17 pm
ORD
- BZN
1 stop25h 28m
Alaska Airlines
Sun 9/69:20 am
BZN
- ORD
1 stop9h 01m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:10 pm
MDW
- BZN
2 stops8h 15m
Southwest
Tue 9/156:55 am
BZN
- MDW
2 stops12h 55m
Southwest
Deal found 8/1![Southwest logo]()
$375
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/141:55 pm
ORD
- BZN
2 stops10h 24m
Delta
Mon 9/213:38 pm
BZN
- ORD
1 stop7h 19m
Delta
Deal found 7/31![Delta logo]()
$320
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 am
ORD
- FCA
1 stop8h 28m
United Airlines
Tue 10/202:30 pm
FCA
- ORD
1 stop7h 16m
United Airlines
Deal found 7/31![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/2212:20 pm
STL
- BZN
1 stop8h 45m
Southwest
Tue 8/256:55 am
BZN
- STL
1 stop7h 10m
Southwest
Deal found 7/30![Southwest logo]()
$378
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/192:05 pm
ORD
- BZN
2 stops9h 44m
Delta
Mon 9/213:38 pm
BZN
- ORD
1 stop7h 19m
Delta
Deal found 8/3![Delta logo]()
$320
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/163:50 pm
ORD
- FCA
Nonstop4h 04m
United Airlines
Tue 8/255:04 pm
FCA
- ORD
1 stop5h 55m
United Airlines
Deal found 7/30![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/309:35 am
STL
- BZN
2 stops9h 00m
Southwest
Mon 11/27:55 am
BZN
- STL
2 stops9h 40m
Southwest
Deal found 7/31![Southwest logo]()
$380
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:00 am
ORD
- MSO
1 stop8h 17m
Alaska Airlines
Mon 9/287:00 am
MSO
- ORD
1 stop10h 01m
Alaska Airlines
Deal found 8/3![Alaska Airlines logo]()
$463
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:59 pm
ORD
- BZN
2 stops9h 04m
Delta
Tue 9/153:38 pm
BZN
- ORD
1 stop7h 19m
Delta
Deal found 8/1![Delta logo]()
$320
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:59 pm
STL
- FCA
2 stops9h 22m
United Airlines
Fri 8/285:04 pm
FCA
- STL
1 stop5h 36m
United Airlines
Deal found 8/3![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/14:50 pm
STL
- BZN
1 stop7h 30m
Southwest
Sat 10/109:40 am
BZN
- STL
1 stop12h 10m
Southwest
Deal found 7/30![Southwest logo]()
$384
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:45 am
ORD
- GTF
1 stop5h 50m
Delta
Sat 9/261:15 pm
GTF
- ORD
1 stop7h 45m
Delta
Deal found 8/1![Delta logo]()
$328
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:00 am
ORD
- BIL
1 stop5h 51m
United Airlines
Tue 12/82:40 pm
BIL
- ORD
1 stop5h 33m
United Airlines
Deal found 8/1![United Airlines logo]()
$371
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:20 pm
STL
- BZN
1 stop6h 10m
Southwest
Tue 9/156:55 am
BZN
- STL
1 stop9h 55m
Southwest
Deal found 8/3![Southwest logo]()
$388
Last-minute flights from Illinois to MontanaDiscover last-minute flight deals from Illinois to Montana. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Montana. Data last updated August 4, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:42 am
STL
- FCA
1 stop6h 54m
American Airlines
Thu 8/273:45 pm
FCA
- STL
1 stop6h 57m
American Airlines
Deal found 8/1![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:26 pm
ORD
- BIL
1 stop5h 34m
United Airlines
Tue 9/82:29 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Deal found 8/2![United Airlines logo]()
$294
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:56 pm
ORD
- BIL
1 stop6h 04m
United Airlines
Sat 9/1211:43 am
BIL
- ORD
Nonstop3h 05m
United Airlines
Deal found 8/3![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/96:24 pm
ORD
- BIL
1 stop5h 51m
Delta
Sat 9/125:20 am
BIL
- ORD
1 stop5h 35m
Delta
Deal found 7/31![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/145:50 pm
ORD
- BZN
1 stop6h 29m
Delta
Mon 9/213:38 pm
BZN
- ORD
1 stop7h 19m
Delta
Deal found 7/31![Delta logo]()
$315
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/145:30 pm
MDW
- BZN
1 stop7h 15m
Southwest
Mon 9/212:30 pm
BZN
- MDW
1 stop8h 20m
Southwest
Deal found 7/31![Southwest logo]()
$315
This SmartFares deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:00 am
ORD
- MSO
1 stop8h 17m
Alaska Airlines
Wed 9/234:16 pm
MSO
- ORD
1 stop6h 43m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:55 pm
ORD
- FCA
1 stop23h 48m
Multiple Airlines
Mon 9/218:46 pm
FCA
- ORD
1 stop7h 52m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$320
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/208:15 am
ORD
- BZN
1 stop8h 11m
American Airlines
Tue 9/2912:02 pm
BZN
- ORD
1 stop7h 28m
American Airlines
Deal found 7/30![American Airlines logo]()
$316
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:45 am
ORD
- FCA
Nonstop3h 59m
American Airlines
Sat 10/31:34 pm
FCA
- ORD
Nonstop3h 44m
American Airlines
Deal found 7/30![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:15 am
MDW
- BZN
1 stop9h 35m
Southwest
Thu 10/16:15 pm
BZN
- MDW
1 stop10h 25m
Southwest
Deal found 8/3![Southwest logo]()
$320
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:40 pm
ORD
- BZN
1 stop5h 39m
Delta
Thu 10/18:25 am
BZN
- ORD
2 stops12h 30m
Delta
Deal found 8/3![Delta logo]()
$322
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 August 4, 2026.
Search for one-way flight options from Illinois to Montana. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This SmartFares deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/153:52 pm
ORD
- BZN
1 stop8h 07m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/2711:06 am
ORD
- BZN
2 stops47h 00m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/2811:06 am
ORD
- BZN
2 stops23h 00m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:30 am
ORD
- MSO
2 stops32h 20m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$143
This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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.
Mon 9/79:45 am
ORD
- BZN
Nonstop3h 20m
American Airlines
Deal found 7/31![American Airlines logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/2811:06 am
ORD
- MSO
2 stops30h 17m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$147
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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.
Wed 9/3010:05 am
MDW
- BZN
Nonstop3h 10m
Southwest
Deal found 7/30![Southwest logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:30 am
ORD
- BZN
2 stops27h 36m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:30 am
ORD
- BZN
2 stops51h 36m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:00 pm
ORD
- BIL
1 stop19h 29m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:50 am
ORD
- FCA
1 stop11h 21m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:58 pm
STL
- BZN
2 stops21h 02m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$156
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 August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $271 (United Airlines) |
One-way from | $138 (SmartFares) |
Popular in | October |
Cheapest in | April |
Average price | $375 |
Good round-trip deal | $326 or less |
Good one-way deal | $187 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 August 4, 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
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Tue 10/27
5:48 pm-10:30 pm
1 stop5h 42m
Billings Logan Intl
Wed 11/4
7:00 am-2:55 pm
1 stop6h 55m
$281
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Tue 10/27
10:44 am-10:25 pm
2 stops12h 41m
Billings Logan Intl
Wed 11/4
12:58 pm-10:00 pm
1 stop8h 02m
$286
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Thu 10/8
7:00 am-2:54 pm
1 stop8h 54m
Bozeman Gallatin Field
Tue 10/13
8:25 am-4:53 pm
1 stop7h 28m
$315
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Sun 11/1
7:35 am-12:18 pm
1 stop5h 43m
Billings Logan Intl
Sat 11/7
12:58 pm-9:36 pm
2 stops7h 38m
$317
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Tue 10/27
10:44 am-10:25 pm
2 stops12h 41m
Billings Logan Intl
Thu 11/5
6:01 am-11:39 am
1 stop4h 38m
$317
St. LouisKalispell
STL - FCA
STLFCA
Lambert-St Louis
Sat 8/29
5:00 pm-10:53 pm
1 stop6h 53m
Kalispell Glacier Park
Wed 9/2
6:20 am-3:10 pm
1 stop7h 50m
$319
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Fri 9/25
6:15 am-2:50 pm
1 stop9h 35m
Bozeman Gallatin Field
Thu 10/1
6:15 pm-5:40 am
1 stop10h 25m
$320
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Wed 9/9
2:32 pm-9:00 pm
1 stop7h 28m
Billings Logan Intl
Sat 9/12
11:43 am-3:48 pm
Nonstop3h 05m
$320
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Mon 9/14
1:55 pm-11:19 pm
2 stops10h 24m
Bozeman Gallatin Field
Mon 9/21
3:38 pm-11:57 pm
1 stop7h 19m
$320
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Sat 9/19
2:05 pm-10:49 pm
2 stops9h 44m
Bozeman Gallatin Field
Mon 9/21
3:38 pm-11:57 pm
1 stop7h 19m
$320
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-BIL
ORD-MSO
ORD-BZN
MDW-BZN
STL-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
ORD-BIL
ORD-MSO
ORD-BZN
MDW-BZN
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 $344). Flying from Illinois to Montana in July is currently the most expensive (average of $457). 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 August 4, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 35% 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 August 4, 2026.
The most flights from USIL to USMT are scheduled on a Monday (9 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Illinois to Montana?
Airfare is typical for this route at the moment.
Illinois to Montana flights typically cost between $285 and $445 in October.The cheapest round-trip price found within the last 5 days was $315 on Delta (Oct 14-Oct 17).
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 39 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 August 1, 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. Friday 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 August 4, 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
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentSarah,Aug 2024
MDW - AUS
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.
Browse thousands of different 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 August 4, 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 August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$216 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$225 | Average$445 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$226 | Average$513 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$232 | Average$442 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$269 | Average$412 | FlexibilityNo cancel fee | On-time63% |