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$87+ 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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
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 November 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$198
(SmartFares)

One-way from

$87
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$329

Good round-trip deal

$285 or less

Good one-way deal

$225 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. 5% potential increase in price ($21 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 November 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 November 26, 2025.

This United Airlines deal was found by Cheapflights users on 11/26. 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 12/187:58 pmORD - BZN
Nonstop3h 31mUnited Airlines
Tue 12/234:14 pmBZN - ORD
Nonstop3h 11mUnited Airlines
Deal found 11/26$229
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/89:00 amSTL - BZN
1 stop7h 31mUnited Airlines
Wed 12/102:42 pmBZN - STL
1 stop5h 15mUnited Airlines
Deal found 11/24$239
This Delta deal was found by Cheapflights users on 11/23. 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 12/166:00 amORD - BZN
1 stop8h 12mDelta
Thu 12/185:30 amBZN - ORD
1 stop6h 10mDelta
Deal found 11/23$249
This Delta deal was found by Cheapflights users on 11/23. 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 12/167:02 pmMDW - BZN
1 stop5h 35mDelta
Thu 12/182:36 pmBZN - MDW
1 stop8h 11mDelta
Deal found 11/23$249
This Alaska Airlines deal was found by Cheapflights users on 11/25. 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 12/126:00 amORD - BZN
1 stop9h 04mAlaska Airlines
Tue 12/162:58 pmBZN - ORD
1 stop8h 01mAlaska Airlines
Deal found 11/25$253
This Delta deal was found by Cheapflights users on 11/23. 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 12/163:50 pmORD - BZN
2 stops9h 28mDelta
Sat 12/2012:15 pmBZN - ORD
1 stop8h 21mDelta
Deal found 11/23$254
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/159:20 amORD - BZN
Nonstop3h 28mUnited Airlines
Mon 12/227:15 amBZN - ORD
Nonstop3h 19mUnited Airlines
Deal found 11/24$255
This Delta deal was found by Cheapflights users on 11/23. 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 12/97:05 amSTL - BZN
1 stop7h 21mDelta
Sat 12/135:30 amBZN - STL
1 stop7h 00mDelta
Deal found 11/23$257
This United Airlines deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/208:15 pmORD - BZN
Nonstop3h 31mUnited Airlines
Sat 12/274:14 pmBZN - ORD
Nonstop3h 11mUnited Airlines
Deal found 11/25$260
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/109:20 amORD - BZN
Nonstop3h 28mUnited Airlines
Mon 12/154:30 pmBZN - ORD
1 stop6h 29mUnited Airlines
Deal found 11/24$264
This Delta deal was found by Cheapflights users on 11/24. 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 12/106:15 amSTL - FCA
1 stop6h 16mDelta
Sun 12/145:00 amFCA - STL
1 stop7h 30mDelta
Deal found 11/24$269
This Delta deal was found by Cheapflights users on 11/24. 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 12/157:50 amORD - BZN
1 stop7h 28mDelta
Mon 12/223:20 pmBZN - ORD
1 stop7h 42mDelta
Deal found 11/24$270

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 November 26, 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

Tue 2/24

10:10 am-12:39 pm

Nonstop3h 29m

Bozeman Gallatin Field

Sat 2/28

7:00 am-11:15 am

Nonstop3h 15m

$214

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Mon 1/12

5:35 pm-10:15 pm

1 stop5h 40m

Bozeman Gallatin Field

Wed 1/21

3:50 pm-9:50 pm

1 stop5h 00m

$219

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Wed 1/21

1:49 pm-8:06 pm

1 stop7h 17m

Bozeman Gallatin Field

Tue 1/27

6:00 am-1:09 pm

1 stop6h 09m

$219

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Wed 1/21

9:11 am-11:44 am

Nonstop3h 33m

Bozeman Gallatin Field

Tue 1/27

6:15 am-2:55 pm

1 stop7h 40m

$221

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Thu 1/22

3:35 pm-11:56 pm

1 stop9h 21m

Bozeman Gallatin Field

Sun 1/25

3:03 pm-11:50 pm

1 stop7h 47m

$224

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sat 2/7

7:30 am-2:20 pm

1 stop7h 50m

Bozeman Gallatin Field

Tue 2/10

3:00 pm-11:53 pm

1 stop7h 53m

$231

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Thu 2/5

2:20 pm-10:27 pm

1 stop9h 07m

Bozeman Gallatin Field

Tue 2/10

3:00 pm-11:53 pm

1 stop7h 53m

$231

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Fri 1/9

9:11 am-11:44 am

Nonstop3h 33m

Bozeman Gallatin Field

Mon 1/12

2:30 pm-9:15 pm

1 stop5h 45m

$233

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sat 1/24

9:00 am-11:33 am

Nonstop3h 33m

Bozeman Gallatin Field

Sat 1/31

10:50 am-6:46 pm

1 stop6h 56m

$233

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sun 2/8

6:00 pm-11:17 pm

1 stop6h 17m

Bozeman Gallatin Field

Sun 2/15

3:05 pm-11:52 pm

1 stop7h 47m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/25

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 $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 November 26, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 23% 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 December 16, 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 November 26, 2025.

The most flights from USIL to USMT are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 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 November 26, 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
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Alaska Airlines
8.0
Very good
11,363 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Southwest
8.0
Very good
4,254 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
Delta
7.9
Good
8,003 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
United Airlines
7.4
Good
9,050 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.
American Airlines
7.2
Good
11,037 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

LAX - LIH

The staff were exceptional! They all were kind, accommodating, and professional.

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 3h 29m. Airlines will cover a distance of 1182 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 Alaska Airlines, which is currently one of the cheapest options available, starting at $98. American Airlines flights start at $106 while deals on Delta start at $110 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 $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.

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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$152Average$436FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$211Average$441FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$232Average$545FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$315FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$270Average$493FlexibilityNo cancel feeOn-time75%

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