HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$89+ Cheap flights from Montana to Illinois

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Montana to Illinois with Cheapflights

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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 Montana to Illinois

Keep the following information in mind while searching for Montana to Illinois flight deals. Data was last updated June 12, 2025.

Round-trip from

$191
(American Airlines)

One-way from

$89
(Kiwi.com)

Popular in

November

Cheapest in

January

Average price

$351

Good round-trip deal

$258 or less

Good one-way deal

$181 or less
From Montana to Illinois
Search Deals
One-way flight from Montana to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
Price to beat on a round-trip flight from Montana to Illinois.
Search Deals
Price to beat on a one-way flight from Montana to Illinois.
Search Deals

Find flight deals from Montana to Illinois

Cheapest flights from Montana to Illinois
Explore the most affordable flight options available from Montana to Illinois. 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 6/11. 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 8/1412:19 pmBIL - ORD
Nonstop2h 52mAmerican Airlines
Mon 8/189:45 amORD - BIL
Nonstop3h 04mAmerican Airlines
Deal found 6/11$191
This Hawaiian 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/123:08 pmBZN - ORD
1 stop7h 51mHawaiian Airlines
Sun 9/146:20 amORD - BZN
1 stop8h 54mHawaiian Airlines
Deal found 6/11$196
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/123:08 pmBZN - ORD
1 stop7h 51mAlaska Airlines
Mon 9/156:20 amORD - BZN
1 stop8h 54mAlaska Airlines
Deal found 6/11$197
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.
Thu 10/21:39 pmBZN - ORD
Nonstop3h 17mAmerican Airlines
Tue 10/712:17 pmORD - BZN
Nonstop3h 15mAmerican Airlines
Deal found 6/11$204
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/204:20 pmBZN - ORD
1 stop6h 39mUnited Airlines
Sat 9/274:40 pmORD - BZN
Nonstop3h 18mUnited Airlines
Deal found 6/12$207
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/511:16 amBZN - STL
1 stop26h 49mAlaska Airlines
Mon 11/107:00 amSTL - BZN
1 stop8h 02mAlaska Airlines
Deal found 6/10$214
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2510:26 pmBIL - ORD
1 stop19h 18mMultiple Airlines
Mon 7/287:08 amORD - BIL
1 stop15h 28mMultiple Airlines
Deal found 6/10$218
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.
Fri 8/151:49 pmBIL - ORD
1 stop7h 50mUnited Airlines
Wed 8/208:55 amORD - BIL
Nonstop3h 21mUnited Airlines
Deal found 6/10$220
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.
Fri 7/111:47 pmMSO - ORD
1 stop8h 59mAmerican Airlines
Sun 7/138:34 pmORD - MSO
Nonstop3h 55mAmerican 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.
Thu 7/102:36 pmBZN - ORD
1 stop22h 37mMultiple Airlines
Thu 7/177:08 amORD - BZN
1 stop7h 38mMultiple Airlines
Deal found 6/12$223
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/28:00 pmBZN - MDW
1 stop8h 15mSouthwest
Tue 10/75:20 amMDW - BZN
1 stop6h 50mSouthwest
Deal found 6/10$224
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.
Mon 8/184:54 pmBZN - STL
1 stop5h 57mAmerican Airlines
Thu 8/218:50 amSTL - BZN
1 stop8h 00mAmerican Airlines
Deal found 6/10$237

Cheapflights Fare Finder

Customize your flight search to find flights from Montana to Illinois 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 Montana to Illinois that are best for you.

Fly from

Montana

Fly to

Illinois

Route

Depart

Return

Price

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Thu 8/14

12:19 pm-4:11 pm

Nonstop2h 52m

Chicago O'Hare Intl

Mon 8/18

9:45 am-11:49 am

Nonstop3h 04m

$191

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 9/12

3:08 pm-11:59 pm

1 stop7h 51m

Chicago O'Hare Intl

Sun 9/14

6:20 am-2:14 pm

1 stop8h 54m

$196

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 9/12

3:08 pm-11:59 pm

1 stop7h 51m

Chicago O'Hare Intl

Mon 9/15

6:20 am-2:14 pm

1 stop8h 54m

$197

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 10/2

1:39 pm-5:56 pm

Nonstop3h 17m

Chicago O'Hare Intl

Tue 10/7

12:17 pm-2:32 pm

Nonstop3h 15m

$204

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Sat 9/20

4:20 pm-11:59 pm

1 stop6h 39m

Chicago O'Hare Intl

Sat 9/27

4:40 pm-6:58 pm

Nonstop3h 18m

$207

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Wed 11/5

2:56 pm-3:05 pm

1 stop23h 09m

Lambert-St Louis

Mon 11/10

7:00 am-2:02 pm

1 stop8h 02m

$214

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Fri 7/25

10:26 pm-6:44 pm

1 stop19h 18m

Chicago O'Hare Intl

Mon 7/28

7:08 am-9:36 pm

1 stop15h 28m

$218

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Fri 8/15

1:49 pm-10:39 pm

1 stop7h 50m

Chicago O'Hare Intl

Wed 8/20

8:55 am-11:16 am

Nonstop3h 21m

$220

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Fri 7/11

1:47 pm-11:46 pm

1 stop8h 59m

Chicago O'Hare Intl

Sun 7/13

8:34 pm-11:29 pm

Nonstop3h 55m

$221

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 7/10

2:36 pm-2:13 pm

1 stop22h 37m

Chicago O'Hare Intl

Thu 7/17

7:08 am-1:46 pm

1 stop7h 38m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Montana to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Montana 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 Montana to Illinois

What is the cheapest month to book a flight from Montana to Illinois?

Currently, August is the cheapest month in which you can book a flight from Montana to Illinois (average of $245). Flying from Montana to Illinois in March is currently the most expensive (average of $321). 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 MT to IL?

Find hourly flight availability from Montana to Illinois. 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.

When flying from Montana to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Montana to Illinois

Explore weekly flight availability from Montana to Illinois. 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 USMT to USIL are scheduled on a Thursday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Montana to Illinois to help guide your decision. 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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

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 Montana to Illinois. 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 Montana to Illinois one-way?

    The cheapest airline one-way is Hawaiian Airlines, with whom users have recently found tickets for as low as $89. However, be on the lookout for offers from Southwest and American Airlines, as they are both options that can get you from Montana to Illinois for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Montana to Illinois 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 Montana to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Montana to Illinois (average of $245). Flying from Montana to Illinois in March is currently the most expensive (average of $321). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Montana to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
John F Kennedy Intl to Miami flights
Dallas/Fort Worth to LaGuardia flights
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to Seattle flights
John F Kennedy Intl to O'Hare Intl flights
Newark to Fort Lauderdale flights
John F Kennedy Intl to Los Angeles flights
Los Angeles to Seattle flights
Los Angeles to Newark flights
Dallas/Fort Worth to Newark flights
John F Kennedy Intl to Orlando flights
Newark to Miami flights
Newark to Los Angeles flights
LaGuardia to O'Hare Intl flights
LaGuardia to Miami flights
Newark to Seattle flights
John F Kennedy Intl to Seattle flights
O'Hare Intl to John F Kennedy Intl flights
Dallas/Fort Worth to O'Hare Intl flights
LaGuardia to Dallas/Fort Worth flights
John F Kennedy Intl to Fort Lauderdale flights
San Francisco to John F Kennedy Intl flights
Seattle to Los Angeles flights
LaGuardia to Fort Lauderdale flights
Newark to Orlando flights
San Francisco to Newark flights
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Los Angeles to Honolulu flights
Los Angeles to O'Hare Intl flights
Dallas/Fort Worth to Las Vegas flights
Newark to O'Hare Intl flights
O'Hare Intl to Seattle flights
Dallas/Fort Worth to Los Angeles flights
O'Hare Intl to Las Vegas flights
Los Angeles to LaGuardia flights
Newark to Las Vegas flights
Los Angeles to San Francisco flights
Hobby to Las Vegas flights
John F Kennedy Intl to Atlanta flights
LaGuardia to Denver flights
Los Angeles to Dallas/Fort Worth flights
Atlanta to John F Kennedy Intl flights
San Francisco to Seattle flights
Newark to Dallas/Fort Worth flights
Fort Lauderdale to LaGuardia flights
Atlanta to LaGuardia flights
O'Hare Intl to LaGuardia flights
Hobby to Seattle flights

Top 5 airlines flying from Montana to Illinois

Discover the top 5 airlines that operate flights from Montana to Illinois. 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$197Average$378FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$205Average$462FlexibilityNo cancel feeOn-time75%
DeltaCheapest$216Average$423FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$238Average$519FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$388Average$418FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.