$106+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Feb 13 — Feb 201
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Montana
Keep the following information in mind while searching for Illinois to Montana flight deals. Data was last updated January 14, 2026.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $211 (United Airlines) |
One-way from | $106 (United Airlines) |
Popular in | March |
Cheapest in | September |
Average price | $320 |
Good round-trip deal | $299 or less |
Good one-way deal | $175 or less |
Find flight deals from Illinois to Montana
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 January 14, 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 January 14, 2026.
This United Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/38:45 am
STL
- BZN
1 stop5h 41m
United Airlines
Tue 2/106:15 am
BZN
- STL
1 stop6h 01m
United Airlines
Deal found 1/12![United Airlines logo]()
$211
This American Airlines deal was found by Cheapflights users on 1/13. 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.
Mon 2/235:12 am
STL
- BZN
1 stop8h 45m
American Airlines
Fri 2/273:36 pm
BZN
- STL
1 stop6h 22m
American Airlines
Deal found 1/13![American Airlines logo]()
$231
This Delta deal was found by Cheapflights users on 1/11. 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 3/178:55 am
ORD
- BZN
1 stop5h 11m
Delta
Tue 3/245:20 am
BZN
- ORD
1 stop6h 03m
Delta
Deal found 1/11![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/35:29 pm
ORD
- MSO
1 stop7h 30m
Alaska Airlines
Wed 3/41:39 pm
MSO
- ORD
1 stop9h 17m
Alaska Airlines
Deal found 1/12![Alaska Airlines logo]()
$237
This American Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/147:09 pm
ORD
- BZN
Nonstop3h 29m
American Airlines
Thu 2/193:36 pm
BZN
- ORD
1 stop7h 00m
American Airlines
Deal found 1/12![American Airlines logo]()
$239
This United Airlines deal was found by Cheapflights users on 1/12. 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 10/15:15 am
ORD
- BIL
1 stop5h 36m
United Airlines
Thu 10/2212:30 pm
BIL
- ORD
Nonstop3h 00m
United Airlines
Deal found 1/12![United Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 1/13. 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.
Sat 3/216:40 pm
ORD
- BZN
Nonstop3h 29m
American Airlines
Fri 3/277:00 am
BZN
- ORD
Nonstop3h 11m
American Airlines
Deal found 1/13![American Airlines logo]()
$240
This Delta deal was found by Cheapflights users on 1/11. 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 3/173:59 pm
ORD
- BZN
2 stops8h 11m
Delta
Fri 3/275:20 am
BZN
- ORD
1 stop6h 03m
Delta
Deal found 1/11![Delta logo]()
$242
This Alaska Airlines deal was found by Cheapflights users on 1/11. 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 3/177:00 am
ORD
- BZN
1 stop8h 08m
Alaska Airlines
Mon 3/237:26 pm
BZN
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 1/11![Alaska Airlines logo]()
$244
This United Airlines deal was found by Cheapflights users on 1/13. 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.
Thu 11/122:18 pm
ORD
- BZN
1 stop7h 49m
United Airlines
Mon 11/162:37 pm
BZN
- ORD
1 stop7h 08m
United Airlines
Deal found 1/13![United Airlines logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 1/12. 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 2/52:50 pm
STL
- BZN
1 stop10h 06m
Alaska Airlines
Thu 2/123:02 pm
BZN
- STL
1 stop7h 57m
Alaska Airlines
Deal found 1/12![Alaska Airlines logo]()
$245
This United Airlines deal was found by Cheapflights users on 1/13. 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.
Tue 2/178:40 am
ORD
- BZN
1 stop5h 56m
United Airlines
Tue 2/244:29 pm
BZN
- ORD
1 stop5h 23m
United Airlines
Deal found 1/13![United Airlines logo]()
$249
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 January 14, 2026.
Use the filters below to find and compare flights from Illinois to Montana that are best for you.
Fly from
Illinois
Fly to
Montana
Route
Depart
Return
Price
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Wed 2/11
6:20 am-10:30 am
1 stop5h 10m
Bozeman Gallatin Field
Wed 2/18
3:50 pm-10:05 pm
1 stop5h 15m
$211
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Tue 3/17
3:59 pm-8:14 pm
1 stop5h 15m
Bozeman Gallatin Field
Fri 3/27
5:20 am-12:23 pm
1 stop6h 03m
$237
ChicagoMissoula
ORD - MSO
ORDMSO
Chicago O'Hare Intl
Tue 3/3
5:29 pm-11:59 pm
1 stop7h 30m
Missoula Johnson-Bell Field
Wed 3/4
1:39 pm-11:56 pm
1 stop9h 17m
$237
ChicagoBozeman
ORD - BZN
ORDBZN
Chicago O'Hare Intl
Tue 3/17
3:59 pm-11:10 pm
2 stops8h 11m
Bozeman Gallatin Field
Thu 3/26
3:19 pm-11:52 pm
1 stop7h 33m
$242
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Wed 2/25
7:00 am-2:08 pm
1 stop8h 08m
Bozeman Gallatin Field
Wed 3/4
3:02 pm-1:51 pm
1 stop21h 49m
$245
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Thu 2/5
2:50 pm-11:56 pm
1 stop10h 06m
Bozeman Gallatin Field
Thu 2/12
3:02 pm-11:59 pm
1 stop7h 57m
$245
St. LouisBozeman
STL - BZN
STLBZN
Lambert-St Louis
Tue 2/3
9:57 am-9:33 pm
2 stops12h 36m
Bozeman Gallatin Field
Tue 2/10
2:30 pm-8:58 pm
1 stop5h 28m
$246
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Sat 1/31
5:35 am-1:25 pm
1 stop8h 50m
Bozeman Gallatin Field
Fri 2/6
7:40 am-2:25 pm
1 stop5h 45m
$249
ChicagoBillings
ORD - BIL
ORDBIL
Chicago O'Hare Intl
Tue 2/3
7:00 am-1:24 pm
1 stop7h 24m
Billings Logan Intl
Sat 2/7
2:45 pm-9:15 pm
1 stop5h 30m
$249
ChicagoBozeman
MDW - BZN
MDWBZN
Chicago Midway
Tue 2/3
1:51 pm-8:06 pm
1 stop7h 15m
Bozeman Gallatin Field
Mon 2/9
6:00 am-1:06 pm
1 stop6h 06m
$249
Showing 1-10 of 60 results
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.
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
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 March is currently the most expensive (average of $289). 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 January 14, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 20% 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 January 10, 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.
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 January 14, 2026.
Read reviews from past customers who have flown Southwest, Alaska Airlines, and Delta from Illinois to Montana. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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 January 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$152 | Average$429 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$211 | Average$434 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$232 | Average$534 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$236 | Average$315 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$268 | Average$522 | FlexibilityNo cancel fee | On-time75% |