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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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BZN
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$210
(American Airlines)

One-way from

$97
(Mytrip)

Popular in

December

Cheapest in

April

Average price

$391

Good round-trip deal

$276 or less

Good one-way deal

$144 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. 8% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/149:45 amORD - BIL
Nonstop3h 04mAmerican Airlines
Tue 8/195:49 amBIL - ORD
Nonstop2h 50mAmerican Airlines
Deal found 6/10$210
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/173:18 pmORD - MSO
1 stop25h 12mMultiple Airlines
Mon 7/219:54 pmMSO - ORD
1 stop15h 19mMultiple Airlines
Deal found 6/12$211
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/107:08 amORD - GTF
1 stop27h 16mMultiple Airlines
Mon 7/1410:14 amGTF - ORD
1 stop18h 49mMultiple Airlines
Deal found 6/11$213
This American Airlines deal was found by Cheapflights users on 6/11. 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 6/306:00 amORD - MSO
1 stop10h 10mAmerican Airlines
Wed 7/95:12 amMSO - ORD
Nonstop3h 24mAmerican Airlines
Deal found 6/11$221
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/411:50 amORD - BIL
1 stop10h 46mMultiple Airlines
Mon 7/1410:26 pmBIL - ORD
1 stop14h 47mMultiple Airlines
Deal found 6/12$224
This American Airlines deal was found by Cheapflights users on 6/11. 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 8/197:23 amSTL - FCA
1 stop6h 11mAmerican Airlines
Tue 8/263:49 pmFCA - STL
1 stop6h 25mAmerican Airlines
Deal found 6/11$227
This Delta deal was found by Cheapflights users on 6/12. 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 8/87:11 amORD - BZN
1 stop10h 23mDelta
Tue 8/125:30 amBZN - ORD
1 stop5h 28mDelta
Deal found 6/12$237
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 8/276:06 amSTL - BZN
1 stop7h 33mAmerican Airlines
Wed 9/33:04 pmBZN - STL
1 stop5h 49mAmerican Airlines
Deal found 6/12$237
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/157:20 pmORD - MSO
1 stop6h 04mDelta
Tue 8/55:30 amMSO - ORD
1 stop5h 23mDelta
Deal found 6/10$237
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/157:20 pmORD - BIL
1 stop5h 47mDelta
Tue 7/225:20 amBIL - ORD
1 stop5h 33mDelta
Deal found 6/10$238
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:00 amORD - BZN
1 stop5h 54mUnited Airlines
Tue 7/157:30 amBZN - ORD
Nonstop3h 06mUnited Airlines
Deal found 6/11$239
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/302:17 pmORD - BIL
1 stop7h 32mUnited Airlines
Tue 10/711:58 amBIL - ORD
Nonstop3h 00mUnited Airlines
Deal found 6/10$239

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 June 12, 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

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Thu 8/14

9:45 am-11:49 am

Nonstop3h 04m

Billings Logan Intl

Tue 8/19

5:49 am-9:39 am

Nonstop2h 50m

$210

ChicagoMissoula

ORD - MSO

ORDMSO

Chicago O'Hare Intl

Thu 7/17

3:18 pm-3:30 pm

1 stop25h 12m

Missoula Johnson-Bell Field

Mon 7/21

9:54 pm-2:13 pm

1 stop15h 19m

$211

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Thu 7/10

7:08 am-9:24 am

1 stop27h 16m

Great Falls

Mon 7/14

10:14 am-6:03 am

1 stop18h 49m

$213

ChicagoMissoula

ORD - MSO

ORDMSO

Chicago O'Hare Intl

Mon 6/30

6:00 am-3:10 pm

1 stop10h 10m

Missoula Johnson-Bell Field

Wed 7/9

5:12 am-9:36 am

Nonstop3h 24m

$221

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Fri 7/4

11:50 am-9:36 pm

1 stop10h 46m

Billings Logan Intl

Mon 7/14

10:26 pm-2:13 pm

1 stop14h 47m

$224

St. LouisKalispell

STL - FCA

STLFCA

Lambert-St Louis

Tue 8/19

7:23 am-12:34 pm

1 stop6h 11m

Kalispell Glacier Park

Tue 8/26

3:49 pm-11:14 pm

1 stop6h 25m

$227

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Fri 8/8

7:11 am-4:34 pm

1 stop10h 23m

Bozeman Gallatin Field

Tue 8/12

5:30 am-11:58 am

1 stop5h 28m

$237

ChicagoMissoula

ORD - MSO

ORDMSO

Chicago O'Hare Intl

Tue 7/15

7:20 pm-12:24 am

1 stop6h 04m

Missoula Johnson-Bell Field

Wed 8/6

5:30 am-11:53 am

1 stop5h 23m

$237

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Wed 8/27

6:06 am-12:39 pm

1 stop7h 33m

Bozeman Gallatin Field

Wed 9/3

3:04 pm-9:53 pm

1 stop5h 49m

$237

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Tue 7/15

7:20 pm-12:07 am

1 stop5h 47m

Billings Logan Intl

Tue 7/22

5:20 am-11:53 am

1 stop5h 33m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 $479). 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 June 12, 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 June 12, 2025.

The most flights from USIL to USMT are scheduled on a Thursday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Montana by month

Plan your trip to Montana by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Montana ranges from 0.4 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. January is typically the driest time to visit Montana when rainfall is around 0.4 in.

Temperature in Montana by month

Plan your trip to Montana by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Montana, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 64.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 15.8 F).

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 June 12, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Illinois to Montana have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $98. United Airlines flights start at $99 while deals on Alaska Airlines start at $104 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 $371). Flying from Illinois to Montana in May is currently the most expensive (average of $479). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$223Average$488FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$225Average$456FlexibilityNo cancel feeOn-time75%
DeltaCheapest$236Average$420FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$248Average$567FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$296Average$481FlexibilityNo cancel feeOn-time63%

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