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$96+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
1 adult, Economy
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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 October 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$208
(American Airlines)

One-way from

$96
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$390

Good round-trip deal

$229 or less

Good one-way deal

$170 or less
Provider with most accurate pricing for Chicago (CHI)-Bozeman Gallatin Field flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Bozeman Gallatin Field flights.
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From Illinois to Montana
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One-way flight from Illinois to Montana
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Highest demand for flights based on searches. 8% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Illinois to Montana.
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Price to beat on a one-way flight from Illinois to Montana.
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Find flight deals from Illinois to Montana

Cheapest flights from Illinois to Montana
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 October 13, 2025.

This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/125:17 amSTL - BZN
1 stop8h 45mAmerican Airlines
Tue 11/181:52 pmBZN - STL
1 stop8h 06mAmerican Airlines
Deal found 10/11$208
This Southwest deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:10 pmSTL - BZN
1 stop8h 05mSouthwest
Mon 11/175:30 amBZN - STL
1 stop4h 50mSouthwest
Deal found 10/11$209
This Alaska Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/63:35 pmORD - FCA
1 stop9h 23mAlaska Airlines
Tue 12/92:00 pmFCA - ORD
1 stop7h 30mAlaska Airlines
Deal found 10/12$228
This Delta deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/58:50 amORD - FCA
1 stop6h 06mDelta
Tue 12/95:00 amFCA - ORD
1 stop6h 40mDelta
Deal found 10/12$237
This Trip.com deal was found by Cheapflights users on 10/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:00 amORD - BZN
1 stop7h 02mHawaiian Airlines
Sat 11/83:02 pmBZN - ORD
1 stop8h 22mHawaiian Airlines
Deal found 10/11$238
This American Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:16 amSTL - BZN
1 stop6h 52mAmerican Airlines
Sat 11/11:00 pmBZN - STL
1 stop8h 08mAmerican Airlines
Deal found 10/12$239
This Alaska Airlines deal was found by Cheapflights users on 10/12. 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.
Fri 11/216:00 amORD - BZN
1 stop9h 03mAlaska Airlines
Mon 11/242:57 pmBZN - ORD
1 stop8h 02mAlaska Airlines
Deal found 10/12$240
This Delta deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/148:50 amORD - FCA
1 stop6h 06mDelta
Mon 11/176:06 pmFCA - ORD
2 stops13h 35mDelta
Deal found 10/13$242
This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/299:40 amORD - BIL
Nonstop3h 10mAmerican Airlines
Sat 11/11:17 pmBIL - ORD
Nonstop2h 58mAmerican Airlines
Deal found 10/11$244
This United Airlines deal was found by Cheapflights users on 10/12. 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 10/286:30 amSTL - BZN
2 stops10h 00mUnited Airlines
Sat 11/16:35 amBZN - STL
1 stop5h 04mUnited Airlines
Deal found 10/12$244
This Kiwi.com deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:00 amORD - BZN
1 stop7h 02mHawaiian Airlines
Wed 11/53:02 pmBZN - ORD
1 stop8h 22mHawaiian Airlines
Deal found 10/11$247
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/25:00 amORD - BZN
1 stop9h 08mHawaiian Airlines
Wed 11/53:02 pmBZN - ORD
1 stop8h 22mHawaiian Airlines
Deal found 10/12$248

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 October 13, 2025.
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

Mon 11/10

5:10 pm-12:15 am

1 stop8h 05m

Bozeman Gallatin Field

Mon 11/17

5:30 am-11:20 am

1 stop4h 50m

$209

ChicagoKalispell

ORD - FCA

ORDFCA

Chicago O'Hare Intl

Fri 11/14

2:05 pm-1:27 pm

1 stop24h 22m

Kalispell Glacier Park

Mon 11/17

1:06 pm-1:09 pm

1 stop23h 03m

$228

ChicagoKalispell

ORD - FCA

ORDFCA

Chicago O'Hare Intl

Fri 1/16

8:00 am-7:06 pm

1 stop12h 06m

Kalispell Glacier Park

Tue 1/20

6:25 am-2:38 pm

1 stop7h 13m

$228

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 2/24

7:45 am-2:25 pm

1 stop7h 40m

Bozeman Gallatin Field

Sat 2/28

3:25 pm-11:59 pm

1 stop7h 34m

$230

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sat 1/10

8:00 am-2:09 pm

1 stop7h 09m

Bozeman Gallatin Field

Wed 1/14

7:25 am-5:10 pm

1 stop8h 45m

$230

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Wed 11/19

4:55 pm-9:40 pm

1 stop5h 45m

Bozeman Gallatin Field

Sun 11/23

2:43 pm-9:54 pm

1 stop6h 11m

$235

ChicagoKalispell

ORD - FCA

ORDFCA

Chicago O'Hare Intl

Fri 11/14

8:50 am-1:56 pm

1 stop6h 06m

Kalispell Glacier Park

Mon 11/17

12:06 pm-6:45 pm

1 stop5h 39m

$237

ChicagoKalispell

ORD - FCA

ORDFCA

Chicago O'Hare Intl

Fri 12/5

8:50 am-1:56 pm

1 stop6h 06m

Kalispell Glacier Park

Tue 12/9

5:00 am-12:40 pm

1 stop6h 40m

$237

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Tue 10/28

7:16 am-1:08 pm

1 stop6h 52m

Bozeman Gallatin Field

Sat 11/1

1:00 pm-10:08 pm

1 stop8h 08m

$239

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Thu 2/5

7:37 pm-10:02 pm

Nonstop3h 25m

Bozeman Gallatin Field

Tue 2/10

2:13 pm-10:09 pm

1 stop6h 56m

$241

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 60 results
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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 $191). 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 October 13, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 22% on flights from Illinois to Montana by exploring options for tickets in the evening.

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 October 13, 2024.

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 mornings 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 October 13, 2025.

The most flights from USIL to USMT are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Montana

Get insights into the airlines that provide service to Montana. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Montana. Reviews last updated October 13, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, 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.
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,070 reviews
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,235 reviews
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
8.0
Very good
7,973 reviews
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,974 reviews
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
11,045 reviews
Alaska Airlines
8.0
Very good
11,070 reviews

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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.

  • How long is the flight from Illinois to Montana?

    Departing from Illinois to Montana will take you 5h 45m. Airlines will cover a distance of 1163 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to Montana one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $96. Alaska Airlines flights start at $104 while deals on Southwest start at $106 one-way.

  • Can I find deals for flights from Illinois to Montana that include hotel bookings?

    Yes. In addition to deals on Illinois to Montana flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Montana?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Montana.

  • Can I find deals for business class flights from Illinois to Montana?

    Yes. Cheapflights offers flight deals from Illinois to Montana by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $191). 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.

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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.
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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 October 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$152Average$436FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$211Average$444FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$232Average$551FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$341FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$268Average$487FlexibilityNo cancel feeOn-time75%

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