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$90+ 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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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 October 29, 2025.

This United Airlines deal was found by Cheapflights users on 10/28. 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 12/412:50 pmBZN - ORD
Nonstop2h 59mUnited Airlines
Sun 12/79:20 amORD - BZN
Nonstop3h 28mUnited Airlines
Deal found 10/28$189
This Southwest deal was found by Cheapflights users on 10/27. 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 12/210:45 amBZN - MDW
1 stop7h 50mSouthwest
Thu 12/45:15 amMDW - BZN
1 stop7h 40mSouthwest
Deal found 10/27$209
This American Airlines deal was found by Cheapflights users on 10/28. 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 12/41:46 pmBZN - ORD
1 stop8h 40mAmerican Airlines
Sun 12/75:18 amORD - BZN
1 stop8h 37mAmerican Airlines
Deal found 10/28$209
This Delta deal was found by Cheapflights users on 10/28. 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 12/42:36 pmBZN - MDW
1 stop8h 11mDelta
Sun 12/76:00 amMDW - BZN
1 stop8h 26mDelta
Deal found 10/28$217
This Delta deal was found by Cheapflights users on 10/27. 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 12/23:00 pmBZN - ORD
1 stop7h 59mDelta
Fri 12/56:45 amORD - BZN
1 stop7h 41mDelta
Deal found 10/27$217
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/1312:45 pmBZN - ORD
Nonstop2h 59mUnited Airlines
Mon 11/179:15 amORD - BZN
Nonstop3h 28mUnited Airlines
Deal found 10/28$219
This Delta deal was found by Cheapflights users on 10/28. 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 11/206:04 amBZN - ORD
2 stops9h 42mDelta
Sun 11/237:40 pmORD - BZN
1 stop5h 30mDelta
Deal found 10/28$222
This American Airlines deal was found by Cheapflights users on 10/27. 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 11/151:31 pmBZN - ORD
1 stop9h 06mAmerican Airlines
Wed 11/195:18 amORD - BZN
1 stop8h 44mAmerican Airlines
Deal found 10/27$224
This Delta deal was found by Cheapflights users on 10/28. 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 12/411:45 amBZN - ORD
2 stops7h 10mDelta
Sun 12/75:07 pmORD - BZN
2 stops8h 11mDelta
Deal found 10/28$227
This Delta deal was found by Cheapflights users on 10/27. 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 12/122:36 pmBZN - ORD
1 stop8h 25mDelta
Sun 12/146:00 amORD - BZN
1 stop8h 12mDelta
Deal found 10/27$228
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/244:35 pmBZN - ORD
1 stop6h 24mUnited Airlines
Wed 12/38:45 amORD - BZN
1 stop7h 46mUnited Airlines
Deal found 10/28$236
This Delta deal was found by Cheapflights users on 10/27. 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.
Sat 11/152:35 pmBZN - MDW
1 stop8h 05mDelta
Wed 11/196:00 amMDW - BZN
1 stop8h 25mDelta
Deal found 10/27$238

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 October 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$189
(United Airlines)

One-way from

$90
(Kiwi.com)

Popular in

April

Cheapest in

July

Average price

$329

Good round-trip deal

$343 or less

Good one-way deal

$211 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. 13% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 29, 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

Wed 2/18

3:25 pm-11:59 pm

1 stop7h 34m

Chicago O'Hare Intl

Sat 2/21

7:45 am-2:25 pm

1 stop7h 40m

$208

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 2/24

3:25 pm-11:59 pm

1 stop7h 34m

Chicago O'Hare Intl

Sat 2/28

7:45 am-2:25 pm

1 stop7h 40m

$208

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 2/24

8:00 am-5:50 pm

1 stop8h 50m

Chicago O'Hare Intl

Sat 2/28

7:45 am-2:25 pm

1 stop7h 40m

$208

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Tue 12/2

10:45 am-7:35 pm

1 stop7h 50m

Chicago Midway

Thu 12/4

5:15 am-11:55 am

1 stop7h 40m

$209

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 12/4

2:36 pm-11:47 pm

1 stop8h 11m

Chicago Midway

Sun 12/7

6:00 am-1:26 pm

1 stop8h 26m

$217

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 12/2

3:00 pm-11:59 pm

1 stop7h 59m

Chicago O'Hare Intl

Thu 12/4

6:45 am-1:26 pm

1 stop7h 41m

$217

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 2/24

5:45 am-12:26 pm

1 stop5h 41m

Chicago O'Hare Intl

Sat 2/28

1:35 pm-12:04 am

2 stops11h 29m

$222

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 12/4

2:36 pm-12:01 am

1 stop8h 25m

Chicago O'Hare Intl

Sun 12/7

5:07 pm-12:18 am

2 stops8h 11m

$222

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 12/12

2:36 pm-12:01 am

1 stop8h 25m

Chicago O'Hare Intl

Sun 12/14

6:00 am-1:12 pm

1 stop8h 12m

$228

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Sat 11/15

2:35 pm-11:40 pm

1 stop8h 05m

Chicago Midway

Wed 11/19

6:00 am-1:25 pm

1 stop8h 25m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 60 results
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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 April is currently the most expensive (average of $291). 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 October 29, 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.

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 October 29, 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
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,210 reviews
Alaska Airlines
8.0
Very good
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
7.9
Good
7,992 reviews
Alaska Airlines
8.0
Very good
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,999 reviews
Alaska Airlines
8.0
Very good
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
11,032 reviews
Alaska Airlines
8.0
Very good
11,210 reviews

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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 7h 34m. 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 Montana to Illinois one-way?

    The cheapest airline one-way is Alaska Airlines, with whom users have recently found tickets for as low as $104. However, be on the lookout for offers from Southwest 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 April is currently the most expensive (average of $291). 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 Montana to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$191Average$340FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$229Average$481FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$427FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$349Average$469FlexibilityNo cancel feeOn-time75%

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