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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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
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 August 13, 2025.

Round-trip from

$211
(American Airlines)

One-way from

$96
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$343

Good round-trip deal

$169 or less

Good one-way deal

$174 or less
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. 10% potential increase in price ($49 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 13, 2025.

This American Airlines deal was found by Cheapflights users on 8/11. 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 12/105:00 amORD - BZN
1 stop8h 32mAmerican Airlines
Thu 12/111:51 pmBZN - ORD
1 stop9h 06mAmerican Airlines
Deal found 8/11$211
This Southwest deal was found by Cheapflights users on 8/10. 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 8/269:55 amMDW - BZN
Nonstop3h 10mSouthwest
Thu 9/411:20 amBZN - MDW
Nonstop2h 55mSouthwest
Deal found 8/10$215
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Mon 8/2510:25 amORD - BZN
Nonstop3h 14mAmerican Airlines
Wed 9/31:39 pmBZN - ORD
Nonstop3h 08mAmerican Airlines
Deal found 8/11$216
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:15 amORD - BZN
Nonstop3h 39mUnited Airlines
Tue 8/268:00 amBZN - ORD
Nonstop3h 05mUnited Airlines
Deal found 8/12$221
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/228:25 amMDW - BZN
Nonstop3h 10mSouthwest
Thu 8/2811:20 amBZN - MDW
Nonstop2h 55mSouthwest
Deal found 8/12$221
This American Airlines deal was found by Cheapflights users on 8/12. 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.
Mon 9/157:23 amSTL - FCA
1 stop6h 15mAmerican Airlines
Mon 9/224:53 pmFCA - STL
1 stop5h 55mAmerican Airlines
Deal found 8/12$227
This Hawaiian Airlines deal was found by Cheapflights users on 8/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/96:20 amORD - BZN
1 stop8h 54mHawaiian Airlines
Fri 9/123:08 pmBZN - ORD
1 stop7h 55mHawaiian Airlines
Deal found 8/12$228
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/410:32 amORD - BZN
Nonstop3h 17mAmerican Airlines
Thu 10/912:58 pmBZN - ORD
Nonstop3h 03mAmerican Airlines
Deal found 8/11$229
This Southwest deal was found by Cheapflights users on 8/11. 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 9/228:25 amMDW - BZN
Nonstop3h 10mSouthwest
Thu 9/2511:20 amBZN - MDW
Nonstop2h 55mSouthwest
Deal found 8/11$229
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:50 pmORD - BIL
Nonstop3h 07mAmerican Airlines
Tue 9/912:19 pmBIL - ORD
Nonstop2h 54mAmerican Airlines
Deal found 8/11$229
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Tue 8/2610:25 amORD - BZN
Nonstop3h 14mAmerican Airlines
Tue 9/24:40 pmBZN - ORD
Nonstop3h 09mAmerican Airlines
Deal found 8/11$230
This American Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:50 pmORD - BIL
Nonstop3h 07mAmerican Airlines
Mon 9/86:00 amBIL - ORD
Nonstop2h 53mAmerican Airlines
Deal found 8/11$230

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 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

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sun 8/24

1:36 pm-3:50 pm

Nonstop3h 14m

Bozeman Gallatin Field

Wed 8/27

4:40 pm-8:49 pm

Nonstop3h 09m

$221

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Fri 8/22

7:15 am-9:54 am

Nonstop3h 39m

Bozeman Gallatin Field

Tue 8/26

8:00 am-12:05 pm

Nonstop3h 05m

$221

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Fri 8/22

8:25 am-10:35 am

Nonstop3h 10m

Bozeman Gallatin Field

Thu 8/28

11:20 am-3:15 pm

Nonstop2h 55m

$221

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Fri 8/22

1:36 pm-3:50 pm

Nonstop3h 14m

Bozeman Gallatin Field

Thu 8/28

4:54 pm-9:03 pm

Nonstop3h 09m

$221

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Mon 8/25

10:25 am-12:39 pm

Nonstop3h 14m

Bozeman Gallatin Field

Thu 8/28

4:54 pm-9:03 pm

Nonstop3h 09m

$221

St. LouisKalispell

STL - FCA

STLFCA

Lambert-St Louis

Mon 9/15

7:23 am-12:38 pm

1 stop6h 15m

Kalispell Glacier Park

Mon 9/22

4:53 pm-11:48 pm

1 stop5h 55m

$227

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 9/23

8:00 am-2:14 pm

1 stop7h 14m

Bozeman Gallatin Field

Sat 9/27

1:54 pm-12:04 am

1 stop9h 10m

$228

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Thu 1/15

7:45 am-2:25 pm

1 stop7h 40m

Bozeman Gallatin Field

Sat 1/17

12:43 pm-11:10 pm

1 stop9h 27m

$228

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Wed 9/24

6:20 am-2:14 pm

1 stop8h 54m

Bozeman Gallatin Field

Tue 9/30

11:26 am-10:07 pm

1 stop9h 41m

$228

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 1/13

7:45 am-2:25 pm

1 stop7h 40m

Bozeman Gallatin Field

Sat 1/17

12:43 pm-11:10 pm

1 stop9h 27m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

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 $371). Flying from Illinois to Montana in May is currently the most expensive (average of $478). 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 13, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Montana as you normally would.

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 13, 2025.

The most flights from USIL to USMT are scheduled on a Monday (9 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (5 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 August 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
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
United Airlines
7.4
Good
8,920 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)

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.

  • 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 $371). Flying from Illinois to Montana in May is currently the most expensive (average of $478). 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.

See more FAQs

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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 August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$210Average$454FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$211Average$437FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$225Average$478FlexibilityNo cancel feeOn-time75%
DeltaCheapest$236Average$344FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$268Average$576FlexibilityNo cancel feeOn-time69%

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