$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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Jun 4 — Jun 111
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 May 5, 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 May 5, 2026.
This American Airlines deal was found by Cheapflights users on 5/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:20 pm
ORD
- BIL
Nonstop3h 02m
American Airlines
Wed 9/2312:17 pm
BIL
- ORD
Nonstop2h 53m
American Airlines
Deal found 5/2![American Airlines logo]()
$251
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 9/29:40 am
ORD
- BIL
Nonstop3h 11m
American Airlines
Wed 9/97:16 am
BIL
- ORD
Nonstop2h 54m
American Airlines
Deal found 5/5![American Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 5/3. 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 7/295:54 pm
ORD
- BIL
1 stop6h 26m
Delta
Tue 8/115:10 am
BIL
- ORD
1 stop5h 49m
Delta
Deal found 5/3![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 5/1. 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.
Mon 8/106:59 pm
STL
- BZN
1 stop6h 00m
Delta
Sat 8/155:45 am
BZN
- STL
1 stop6h 36m
Delta
Deal found 5/1![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 5/3. 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 7/292:07 pm
ORD
- BIL
2 stops10h 13m
Delta
Wed 8/125:10 am
BIL
- ORD
1 stop5h 49m
Delta
Deal found 5/3![Delta logo]()
$276
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 9/51:15 pm
ORD
- BIL
2 stops10h 22m
Delta
Sat 9/125:45 am
BIL
- ORD
2 stops8h 13m
Delta
Deal found 5/5![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 5/1. 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.
Thu 7/27:55 pm
STL
- BZN
1 stop5h 28m
Delta
Wed 7/85:15 am
BZN
- STL
1 stop7h 18m
Delta
Deal found 5/1![Delta logo]()
$285
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 9/13:50 pm
ORD
- BIL
1 stop7h 47m
Delta
Mon 9/75:45 am
BIL
- ORD
1 stop5h 36m
Delta
Deal found 5/5![Delta logo]()
$290
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/293:52 pm
ORD
- BZN
1 stop8h 07m
Alaska Airlines
Wed 9/303:40 pm
BZN
- ORD
1 stop7h 01m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 5/1. 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 7/255:00 am
ORD
- BIL
1 stop5h 35m
United Airlines
Sat 8/16:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Deal found 5/1![United Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/103:00 pm
ORD
- BZN
1 stop6h 43m
American Airlines
Sat 6/135:00 pm
BZN
- ORD
Nonstop3h 20m
American Airlines
Deal found 5/5![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 5/2. 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.
Fri 7/36:00 pm
MDW
- BZN
1 stop6h 30m
Southwest
Fri 7/107:35 am
BZN
- MDW
Nonstop2h 50m
Southwest
Deal found 5/2![Southwest logo]()
$295
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 May 5, 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 May 5, 2026.
This Delta deal was found by Cheapflights users on 5/1. 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.
Mon 8/106:59 pm
STL
- BZN
1 stop6h 00m
Delta
Sat 8/155:45 am
BZN
- STL
1 stop6h 36m
Delta
Deal found 5/1![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 5/2. 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.
Mon 6/155:00 am
ORD
- BZN
1 stop5h 37m
United Airlines
Thu 6/188:00 am
BZN
- ORD
Nonstop2h 59m
United Airlines
Deal found 5/2![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 5/2. 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.
Fri 7/36:00 pm
MDW
- BZN
1 stop6h 30m
Southwest
Fri 7/107:35 am
BZN
- MDW
Nonstop2h 50m
Southwest
Deal found 5/2![Southwest logo]()
$295
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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.
Sat 5/167:40 am
ORD
- BZN
1 stop8h 52m
Alaska Airlines
Wed 5/208:00 am
BZN
- ORD
1 stop7h 48m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$365
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/105:29 am
STL
- FCA
1 stop7h 05m
American Airlines
Mon 6/154:48 pm
FCA
- STL
1 stop6h 28m
American Airlines
Deal found 5/5![American Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 5/1. 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.
Thu 8/206:59 pm
STL
- BZN
1 stop6h 00m
Delta
Sun 8/235:45 am
BZN
- STL
1 stop6h 36m
Delta
Deal found 5/1![Delta logo]()
$285
This Southwest deal was found by Cheapflights users on 4/30. 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.
Fri 8/1410:50 am
MDW
- BZN
Nonstop3h 05m
Southwest
Mon 8/172:30 pm
BZN
- MDW
1 stop8h 15m
Southwest
Deal found 4/30![Southwest logo]()
$321
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/82:07 pm
ORD
- BIL
2 stops9h 43m
Delta
Mon 7/135:20 am
BIL
- ORD
1 stop5h 39m
Delta
Deal found 4/30![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/215:10 am
STL
- BZN
1 stop5h 27m
United Airlines
Tue 7/288:00 am
BZN
- STL
1 stop6h 46m
United Airlines
Deal found 5/5![United Airlines logo]()
$356
This Southwest deal was found by Cheapflights users on 5/2. 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 8/182:40 pm
MDW
- BZN
2 stops8h 45m
Southwest
Sat 8/227:10 am
BZN
- MDW
Nonstop2h 55m
Southwest
Deal found 5/2![Southwest logo]()
$326
This Alaska Airlines deal was found by Cheapflights users on 5/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:00 am
STL
- FCA
1 stop7h 28m
Alaska Airlines
Thu 9/108:21 pm
FCA
- STL
1 stop17h 00m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 5/1. 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 6/138:36 am
ORD
- BIL
2 stops10h 24m
Delta
Sat 6/205:20 am
BIL
- ORD
1 stop5h 40m
Delta
Deal found 5/1![Delta logo]()
$307
This United Airlines deal was found by Cheapflights users on 5/1. 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 6/195:00 am
ORD
- BIL
1 stop5h 35m
United Airlines
Sun 6/216:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Deal found 5/1![United Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 5/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/257:00 am
ORD
- FCA
1 stop7h 28m
Alaska Airlines
Fri 9/48:01 pm
FCA
- ORD
1 stop9h 21m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/111:55 pm
ORD
- BZN
2 stops9h 29m
Delta
Tue 8/185:45 am
BZN
- ORD
1 stop5h 36m
Delta
Deal found 4/30![Delta logo]()
$310
This American Airlines deal was found by Cheapflights users on 4/30. 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 9/39:40 am
ORD
- BIL
Nonstop3h 11m
American Airlines
Tue 9/812:21 pm
BIL
- ORD
Nonstop3h 02m
American Airlines
Deal found 4/30![American Airlines logo]()
$427
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2710:50 am
MDW
- BZN
Nonstop3h 05m
Southwest
Mon 8/3112:20 pm
BZN
- MDW
Nonstop2h 55m
Southwest
Deal found 5/4![Southwest logo]()
$361
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 8/251:18 pm
STL
- BZN
1 stop6h 05m
United Airlines
Wed 8/264:22 pm
BZN
- STL
1 stop6h 28m
United Airlines
Deal found 5/5![United Airlines logo]()
$361
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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 9/251:03 pm
ORD
- MSO
1 stop10h 56m
Alaska Airlines
Sun 9/277:00 am
MSO
- ORD
1 stop10h 04m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 5/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:55 pm
ORD
- BZN
1 stop4h 50m
Delta
Fri 7/108:25 am
BZN
- ORD
2 stops12h 23m
Delta
Deal found 5/2![Delta logo]()
$310
This Delta deal was found by Cheapflights users on 5/1. 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 6/25:19 pm
ORD
- BZN
2 stops7h 40m
Delta
Tue 6/95:15 am
BZN
- ORD
2 stops10h 47m
Delta
Deal found 5/1![Delta logo]()
$315
This Southwest deal was found by Cheapflights users on 5/3. 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.
Sat 6/134:10 pm
STL
- BZN
1 stop6h 45m
Southwest
Sat 6/204:00 pm
BZN
- STL
1 stop7h 35m
Southwest
Deal found 5/3![Southwest logo]()
$383
This United Airlines deal was found by Cheapflights users on 5/1. 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 5/306:00 am
STL
- FCA
1 stop6h 29m
United Airlines
Wed 6/35:28 pm
FCA
- STL
1 stop5h 29m
United Airlines
Deal found 5/1![United Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/61:22 pm
MDW
- BZN
2 stops11h 22m
Delta
Sat 6/136:00 am
BZN
- MDW
2 stops11h 11m
Delta
Deal found 5/5![Delta logo]()
$315
This Alaska Airlines deal was found by Cheapflights users on 5/3. 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 5/235:33 pm
STL
- BZN
1 stop20h 44m
Alaska Airlines
Sat 5/3011:43 am
BZN
- STL
1 stop11h 11m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$422
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:50 pm
MDW
- BZN
1 stop7h 00m
Southwest
Wed 7/296:40 am
BZN
- MDW
Nonstop2h 50m
Southwest
Deal found 5/4![Southwest logo]()
$385
This United Airlines deal was found by Cheapflights users on 5/2. 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.
Mon 8/104:48 pm
STL
- MSO
1 stop5h 51m
United Airlines
Fri 8/145:32 pm
MSO
- STL
1 stop5h 18m
United Airlines
Deal found 5/2![United Airlines logo]()
$400
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/214:25 pm
STL
- BZN
1 stop9h 20m
Southwest
Tue 7/287:45 am
BZN
- STL
2 stops9h 15m
Southwest
Deal found 5/5![Southwest logo]()
$391
This Delta deal was found by Cheapflights users on 5/1. 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 6/206:25 pm
ORD
- MSO
1 stop6h 19m
Delta
Sat 6/275:31 am
MSO
- ORD
1 stop5h 29m
Delta
Deal found 5/1![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 5/3. 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 7/145:00 am
ORD
- BIL
1 stop5h 34m
United Airlines
Mon 7/206:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Deal found 5/3![United Airlines logo]()
$403
Last-minute flights from Illinois to MontanaDiscover last-minute flight deals from Illinois to Montana. Data last updated May 5, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Montana. Data last updated May 5, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 5/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:25 am
STL
- BZN
1 stop6h 33m
American Airlines
Wed 6/311:48 am
BZN
- STL
1 stop8h 54m
American Airlines
Deal found 5/4![American Airlines logo]()
$271
This United Airlines deal was found by Cheapflights users on 5/4. 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 5/276:00 am
STL
- FCA
1 stop6h 29m
United Airlines
Sun 5/315:28 pm
FCA
- STL
1 stop5h 29m
United Airlines
Deal found 5/4![United Airlines logo]()
$297
This Delta deal was found by Cheapflights users on 5/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/278:53 am
STL
- FCA
1 stop5h 40m
Delta
Sun 5/315:13 am
FCA
- STL
2 stops11h 03m
Delta
Deal found 5/4![Delta logo]()
$302
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/293:50 pm
ORD
- BIL
1 stop8h 25m
American Airlines
Sun 5/3112:42 pm
BIL
- ORD
Nonstop3h 02m
American Airlines
Deal found 5/5![American Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Mon 6/15:10 am
STL
- BZN
1 stop5h 27m
United Airlines
Mon 6/84:25 pm
BZN
- STL
1 stop6h 04m
United Airlines
Deal found 5/4![United Airlines logo]()
$299
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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.
Wed 6/106:00 am
ORD
- BZN
1 stop9h 09m
Alaska Airlines
Wed 6/171:50 pm
BZN
- ORD
1 stop8h 46m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/103:00 pm
ORD
- BZN
1 stop6h 43m
American Airlines
Sat 6/135:00 pm
BZN
- ORD
Nonstop3h 20m
American Airlines
Deal found 5/5![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/132:15 pm
MDW
- BZN
2 stops8h 40m
Southwest
Wed 6/176:40 am
BZN
- MDW
Nonstop2h 50m
Southwest
Deal found 5/4![Southwest logo]()
$300
This Delta deal was found by Cheapflights users on 5/1. 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 6/133:55 pm
ORD
- BIL
1 stop5h 07m
Delta
Sat 6/205:20 am
BIL
- ORD
1 stop5h 40m
Delta
Deal found 5/1![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 5/2. 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.
Mon 6/158:15 pm
ORD
- BZN
Nonstop3h 28m
United Airlines
Thu 6/188:00 am
BZN
- ORD
Nonstop2h 59m
United Airlines
Deal found 5/2![United Airlines logo]()
$300
This United Airlines deal was found by Cheapflights users on 5/1. 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.
Wed 6/175:10 am
STL
- BZN
1 stop5h 27m
United Airlines
Tue 6/234:29 pm
BZN
- STL
1 stop6h 28m
United Airlines
Deal found 5/1![United Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/195:57 pm
ORD
- BIL
1 stop6h 35m
Delta
Tue 6/236:24 am
BIL
- ORD
1 stop7h 41m
Delta
Deal found 5/5![Delta logo]()
$290
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 May 5, 2026.
Search for one-way flight options from Illinois to Montana. Find affordable one-way fares based on user searches. Data last updated May 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/47:20 am
ORD
- MSO
1 stop27h 14m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 5/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:15 am
ORD
- MSO
1 stop27h 19m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/297:15 am
ORD
- MSO
1 stop27h 19m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$131
This Delta deal was found by Cheapflights users on 5/1. 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.
Wed 6/247:55 pm
STL
- BZN
1 stop5h 28m
Delta
Deal found 5/1![Delta logo]()
$136
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/2910:30 am
ORD
- BZN
Nonstop3h 25m
American Airlines
Deal found 5/5![American Airlines logo]()
$143
This Southwest deal was found by Cheapflights users on 5/1. 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.
Sat 6/611:00 am
MDW
- BZN
Nonstop3h 10m
Southwest
Deal found 5/1![Southwest logo]()
$143
This American Airlines deal was found by Cheapflights users on 5/4. 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 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 5/4![American Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 5/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/279:37 pm
ORD
- BIL
2 stops36h 33m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/279:37 pm
ORD
- BZN
2 stops19h 08m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$145
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/155:36 pm
STL
- FCA
1 stop7h 02m
Delta
Deal found 5/5![Delta logo]()
$149
This Delta deal was found by Cheapflights users on 5/3. 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.
Thu 8/207:35 pm
STL
- BZN
1 stop5h 29m
Delta
Deal found 5/3![Delta logo]()
$150
This Delta deal was found by Cheapflights users on 5/1. 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.
Wed 7/297:40 pm
ORD
- BZN
1 stop5h 43m
Delta
Deal found 5/1![Delta logo]()
$153
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 May 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $251 (American Airlines) |
One-way from | $136 (Delta) |
Popular in | March |
Cheapest in | January |
Average price | $365 |
Good round-trip deal | $330 or less |
Good one-way deal | $182 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 May 5, 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
Mon 8/10
6:59 pm-11:59 pm
1 stop6h 00m
Bozeman Gallatin Field
Sat 8/15
5:45 am-1:21 pm
1 stop6h 36m
$271
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Thu 8/20
6:59 pm-11:59 pm
1 stop6h 00m
Bozeman Gallatin Field
Sun 8/23
5:45 am-1:21 pm
1 stop6h 36m
$285
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Mon 6/15
5:00 am-9:37 am
1 stop5h 37m
Bozeman Gallatin Field
Thu 6/18
8:00 am-11:59 am
Nonstop2h 59m
$295
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Fri 7/3
6:00 pm-11:30 pm
1 stop6h 30m
Bozeman Gallatin Field
Fri 7/10
7:35 am-11:25 am
Nonstop2h 50m
$295
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Wed 7/8
2:07 pm-10:50 pm
2 stops9h 43m
Billings Logan Intl
Mon 7/13
5:20 am-11:59 am
1 stop5h 39m
$295
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Sat 6/13
8:36 am-6:00 pm
2 stops10h 24m
Billings Logan Intl
Sat 6/20
5:20 am-12:00 pm
1 stop5h 40m
$307
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Tue 8/11
1:55 pm-10:24 pm
2 stops9h 29m
Bozeman Gallatin Field
Tue 8/18
5:45 am-12:21 pm
1 stop5h 36m
$310
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Fri 7/3
3:55 pm-7:45 pm
1 stop4h 50m
Bozeman Gallatin Field
Fri 7/10
8:25 am-9:48 pm
2 stops12h 23m
$310
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Tue 6/2
5:19 pm-11:59 pm
2 stops7h 40m
Bozeman Gallatin Field
Tue 6/9
5:15 am-5:02 pm
2 stops10h 47m
$315
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Sat 6/6
1:22 pm-11:44 pm
2 stops11h 22m
Bozeman Gallatin Field
Sat 6/13
6:00 am-6:11 pm
2 stops11h 11m
$315
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-BIL
ORD-BZN
STL-FCA
MDW-BZN
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-BIL
ORD-BZN
STL-FCA
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 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 $593). 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 May 5, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 25% 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 May 2, 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. 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 May 5, 2026.
The most flights from USIL to USMT are scheduled on a Monday (4 on average). You will have fewer flight options on Tuesday, 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?
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 May 5, 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.
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Boarding
8.1
Comfort
7.8
Overall
7.9
Entertainment
7.0
Food
7.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
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 May 5, 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 May 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$210 | Average$404 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$210 | Average$415 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$216 | Average$318 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$480 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$229 | Average$465 | FlexibilityNo cancel fee | On-time69% |