HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$106+ 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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
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

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 December 15, 2025.

This Delta deal was found by Cheapflights users on 12/14. 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 12/242:20 pmBZN - STL
1 stop6h 56mDelta
Sat 1/35:55 amSTL - BZN
1 stop9h 11mDelta
Deal found 12/14$288
This United Airlines deal was found by Cheapflights users on 12/14. 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 12/231:55 pmBZN - STL
1 stop7h 00mUnited Airlines
Sat 1/33:10 pmSTL - BZN
1 stop8h 36mUnited Airlines
Deal found 12/14$298
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/234:14 pmBZN - ORD
Nonstop3h 11mUnited Airlines
Thu 1/89:11 amORD - BZN
Nonstop3h 33mUnited Airlines
Deal found 12/13$304
This Delta deal was found by Cheapflights users on 12/13. 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.
Tue 12/233:20 pmBZN - ORD
1 stop7h 42mDelta
Thu 1/81:50 pmORD - BZN
2 stops9h 37mDelta
Deal found 12/13$329
This United Airlines deal was found by Cheapflights users on 12/15. 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 12/256:15 amBZN - ORD
1 stop6h 04mUnited Airlines
Thu 1/112:45 pmORD - BZN
Nonstop3h 25mUnited Airlines
Deal found 12/15$339
This Delta deal was found by Cheapflights users on 12/13. 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.
Sun 12/2812:36 pmBZN - MDW
1 stop8h 46mDelta
Thu 1/15:59 pmMDW - BZN
1 stop6h 47mDelta
Deal found 12/13$355
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:38 pmFCA - ORD
Nonstop3h 32mUnited Airlines
Thu 1/18:45 amORD - FCA
Nonstop3h 57mUnited Airlines
Deal found 12/13$364
This Delta deal was found by Cheapflights users on 12/15. 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.
Thu 12/2512:15 pmBZN - ORD
2 stops10h 47mDelta
Thu 1/15:30 amORD - BZN
1 stop9h 36mDelta
Deal found 12/15$384
This American Airlines deal was found by Cheapflights users on 12/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:39 amBZN - ORD
Nonstop3h 10mAmerican Airlines
Thu 1/110:10 amORD - BZN
Nonstop3h 34mAmerican Airlines
Deal found 12/13$391
This Southwest deal was found by Cheapflights users on 12/14. 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.
Wed 12/2410:45 amBZN - STL
2 stops9h 15mSouthwest
Sat 1/35:35 amSTL - BZN
1 stop5h 05mSouthwest
Deal found 12/14$410
This United Airlines deal was found by Cheapflights users on 12/15. 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 12/306:35 amBIL - ORD
1 stop5h 44mUnited Airlines
Sat 1/31:48 pmORD - BIL
1 stop8h 36mUnited Airlines
Deal found 12/15$413
This American Airlines deal was found by Cheapflights users on 12/14. 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 12/301:34 pmBZN - ORD
Nonstop3h 20mAmerican Airlines
Sat 1/38:25 amORD - BZN
Nonstop3h 44mAmerican Airlines
Deal found 12/14$415

Find flight deals from Montana to Illinois

Keep the following information in mind while searching for Montana to Illinois flight deals. Data was last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$209
(United Airlines)

One-way from

$106
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$338

Good round-trip deal

$316 or less

Good one-way deal

$151 or less
Provider with most accurate pricing for Bozeman Gallatin Field-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Bozeman Gallatin Field-Chicago (CHI) flights.
Search Deals
From Montana to Illinois
Search Deals
One-way flight from Montana to Illinois
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($95 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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

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 December 15, 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

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 3/26

4:30 pm-11:52 pm

1 stop6h 22m

Chicago O'Hare Intl

Tue 3/31

7:35 pm-10:00 pm

Nonstop3h 25m

$209

BillingsChicago

BIL - MDW

BILMDW

Billings Logan Intl

Tue 3/31

6:25 am-1:23 pm

1 stop5h 58m

Chicago Midway

Tue 4/7

2:03 pm-8:20 pm

1 stop7h 17m

$211

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 1/29

7:20 am-5:10 pm

1 stop8h 50m

Chicago O'Hare Intl

Mon 2/2

8:00 am-2:09 pm

1 stop7h 09m

$228

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Wed 1/21

1:42 pm-5:49 pm

Nonstop3h 07m

Chicago O'Hare Intl

Mon 1/26

10:24 am-12:50 pm

Nonstop3h 26m

$229

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 3/26

2:05 pm-7:59 pm

1 stop4h 54m

Chicago O'Hare Intl

Tue 3/31

7:20 am-2:34 pm

1 stop8h 14m

$233

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 4/30

2:37 pm-10:30 pm

1 stop6h 53m

Chicago O'Hare Intl

Sun 5/3

7:35 pm-9:58 pm

Nonstop3h 23m

$235

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Mon 2/2

2:15 pm-10:09 pm

1 stop6h 54m

Chicago O'Hare Intl

Sat 2/7

6:54 am-1:36 pm

1 stop7h 42m

$249

BillingsChicago

BIL - MDW

BILMDW

Billings Logan Intl

Tue 2/10

6:10 am-1:06 pm

1 stop5h 56m

Chicago Midway

Wed 2/18

1:49 pm-7:39 pm

1 stop6h 50m

$249

BillingsChicago

BIL - MDW

BILMDW

Billings Logan Intl

Fri 2/13

6:20 am-1:07 pm

1 stop5h 47m

Chicago Midway

Tue 2/17

1:49 pm-7:39 pm

1 stop6h 50m

$249

BillingsChicago

BIL - MDW

BILMDW

Billings Logan Intl

Fri 2/13

6:20 am-1:07 pm

1 stop5h 47m

Chicago Midway

Wed 2/18

1:49 pm-7:39 pm

1 stop6h 50m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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, October is the cheapest month in which you can book a flight from Montana to Illinois (average of $169). Flying from Montana to Illinois in November is currently the most expensive (average of $298). 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 December 15, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 46% on flights from Montana to Illinois by exploring options for tickets in the evening.

How much does it cost to fly round-trip from Montana to Illinois?

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 December 15, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Montana to Illinois by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.
Alaska Airlines
8.0
Very good
11,451 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.
Southwest
7.9
Good
4,250 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.
American Airlines
7.2
Good
11,052 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.

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.

  • How long is the flight from Montana to Illinois?

    Departing from Montana to Illinois will take you 5h 58m. Airlines will cover a distance of 1070 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $100. However, be on the lookout for offers from Alaska Airlines and Delta, 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, October is the cheapest month in which you can book a flight from Montana to Illinois (average of $169). Flying from Montana to Illinois in November is currently the most expensive (average of $298). 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.
John F Kennedy Intl to Miami flights
Newark to Fort Lauderdale flights
Newark to Miami flights
LaGuardia to Miami flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Los Angeles to John F Kennedy Intl flights
Dallas/Fort Worth to John F Kennedy Intl flights
John F Kennedy Intl to Orlando flights
Newark to West Palm Beach flights
Dallas/Fort Worth to LaGuardia flights
Newark to Orlando flights
Los Angeles to Newark flights
Dallas/Fort Worth to Newark flights
Newark to Las Vegas flights
Newark to Los Angeles flights
John F Kennedy Intl to Dallas/Fort Worth flights
O'Hare Intl to Las Vegas flights
Seattle to Dallas/Fort Worth flights
Dallas/Fort Worth to Las Vegas flights
Seattle to Los Angeles flights
Boston to Fort Lauderdale flights
O'Hare Intl to John F Kennedy Intl flights
Minneapolis to Sky Harbor Intl flights
John F Kennedy Intl to West Palm Beach flights
Los Angeles to Seattle flights
Seattle to Las Vegas flights
San Francisco to John F Kennedy Intl flights
Newark to Dallas/Fort Worth flights
Atlanta to John F Kennedy Intl flights
Los Angeles to Honolulu flights
O'Hare Intl to Orlando flights
Boston to Miami flights
O'Hare Intl to Dallas/Fort Worth flights
Dulles Intl to Miami flights
LaGuardia to Dallas/Fort Worth flights
John F Kennedy Intl to Tampa flights
LaGuardia to Orlando flights
San Francisco to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Dallas/Fort Worth to Los Angeles flights
O'Hare Intl to Sky Harbor Intl flights
O'Hare Intl to Los Angeles flights
LaGuardia to West Palm Beach flights
Baltimore to Fort Lauderdale flights
Atlanta to LaGuardia flights
Dulles Intl to Orlando flights
Dallas/Fort Worth to Orlando flights

Top 4 airlines flying from Montana to Illinois

Discover the top 4 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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$191Average$338FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$229Average$478FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$394FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$349Average$469FlexibilityNo cancel feeOn-time75%

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.