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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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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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 January 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:02 pm
BZN
-
ORD
1 stop7h 54m
Alaska Airlines
Mon 3/97:00 am
ORD
-
BZN
1 stop8h 08m
Alaska Airlines
Deal found 1/28$229
This United Airlines deal was found by Cheapflights users on 1/28. 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 3/52:43 pm
BZN
-
ORD
1 stop7h 12m
United Airlines
Sun 3/87:41 pm
ORD
-
BZN
Nonstop3h 31m
United Airlines
Deal found 1/28$235
This American Airlines deal was found by Cheapflights users on 1/28. 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 2/123:36 pm
BZN
-
STL
1 stop6h 22m
American Airlines
Mon 2/165:12 am
STL
-
BZN
1 stop8h 45m
American Airlines
Deal found 1/28$239
This American Airlines deal was found by Cheapflights users on 1/27. 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.
Wed 2/181:47 pm
BZN
-
ORD
1 stop6h 38m
American Airlines
Sat 2/217:09 pm
ORD
-
BZN
Nonstop3h 29m
American Airlines
Deal found 1/27$239
This Delta deal was found by Cheapflights users on 1/28. 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 3/56:00 am
BZN
-
MDW
1 stop6h 05m
Delta
Mon 3/92:05 pm
MDW
-
BZN
1 stop7h 09m
Delta
Deal found 1/28$249
This Delta deal was found by Cheapflights users on 1/27. 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 2/246:20 am
BIL
-
MDW
1 stop5h 45m
Delta
Tue 3/31:49 pm
MDW
-
BIL
1 stop6h 50m
Delta
Deal found 1/27$249
This Delta deal was found by Cheapflights users on 1/28. 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.
Fri 3/63:05 pm
BZN
-
ORD
1 stop7h 47m
Delta
Sun 3/87:25 am
ORD
-
BZN
1 stop8h 10m
Delta
Deal found 1/28$249
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Wed 2/185:53 pm
BIL
-
ORD
1 stop5h 06m
United Airlines
Mon 2/232:02 pm
ORD
-
BIL
1 stop8h 19m
United Airlines
Deal found 1/26$249
This Delta deal was found by Cheapflights users on 1/27. 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.
Thu 3/191:05 pm
GTF
-
ORD
1 stop7h 29m
Delta
Wed 3/256:15 am
ORD
-
GTF
2 stops12h 27m
Delta
Deal found 1/27$250
This American Airlines deal was found by Cheapflights users on 1/27. 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 3/77:00 am
BZN
-
ORD
Nonstop3h 11m
American Airlines
Mon 3/910:09 am
ORD
-
BZN
Nonstop3h 29m
American Airlines
Deal found 1/27$250
This American Airlines deal was found by Cheapflights users on 1/28. 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 8/2712:28 pm
BIL
-
ORD
Nonstop2h 51m
American Airlines
Mon 8/318:46 pm
ORD
-
BIL
Nonstop3h 13m
American Airlines
Deal found 1/28$250
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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 2/206:23 am
MSO
-
ORD
1 stop9h 10m
Alaska Airlines
Tue 3/35:29 pm
ORD
-
MSO
1 stop7h 30m
Alaska Airlines
Deal found 1/29$253

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$229
(Alaska Airlines)

One-way from

$106
(United Airlines)

Popular in

April

Cheapest in

October

Average price

$287

Good round-trip deal

$319 or less

Good one-way deal

$179 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. 16% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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 3/5

3:02 pm-11:56 pm

1 stop7h 54m

Chicago O'Hare Intl

Mon 3/9

7:00 am-2:08 pm

1 stop8h 08m

$229

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 3/20

7:00 am-11:11 am

Nonstop3h 11m

Chicago O'Hare Intl

Tue 3/24

10:09 am-12:38 pm

Nonstop3h 29m

$229

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 3/5

1:28 pm-5:37 pm

Nonstop3h 09m

Chicago O'Hare Intl

Sun 3/8

10:09 am-12:38 pm

Nonstop3h 29m

$229

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 3/5

2:43 pm-10:55 pm

1 stop7h 12m

Chicago O'Hare Intl

Sun 3/8

7:41 pm-10:12 pm

Nonstop3h 31m

$235

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Sat 3/7

2:43 pm-10:55 pm

1 stop7h 12m

Chicago O'Hare Intl

Mon 3/9

9:10 am-11:40 am

Nonstop3h 30m

$235

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 3/26

2:43 pm-10:55 pm

1 stop7h 12m

Chicago O'Hare Intl

Sun 3/29

7:40 pm-10:05 pm

Nonstop3h 25m

$235

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 3/20

2:43 pm-11:52 pm

1 stop8h 09m

Chicago O'Hare Intl

Tue 3/24

9:10 am-11:40 am

Nonstop3h 30m

$239

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 4/23

4:19 pm-12:30 am

1 stop7h 11m

Chicago O'Hare Intl

Sun 4/26

9:05 am-11:29 am

Nonstop3h 24m

$239

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Fri 3/20

7:10 pm-5:20 am

1 stop9h 10m

Chicago Midway

Tue 3/24

5:35 pm-9:55 pm

1 stop5h 20m

$249

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 3/5

6:00 am-1:05 pm

1 stop6h 05m

Chicago Midway

Mon 3/9

6:00 am-1:35 pm

1 stop8h 35m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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 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 January 29, 2026.

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 January 29, 2026.

The most flights from USMT to USIL are scheduled on a Monday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

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 January 29, 2026.
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
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
8.0
Very good
11,807 reviews
Alaska Airlines
8.0
Very good
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Southwest
8.0
Very good
4,267 reviews
Alaska Airlines
8.0
Very good
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Delta
7.9
Good
8,128 reviews
Alaska Airlines
8.0
Very good
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
United Airlines
7.4
Good
9,215 reviews
Alaska Airlines
8.0
Very good
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
American Airlines
7.2
Good
11,205 reviews
Alaska Airlines
8.0
Very good
11,807 reviews

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

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 3h 11m. 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 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

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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$166Average$411FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$187Average$472FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$191Average$337FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$349Average$455FlexibilityNo cancel feeOn-time75%

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