What is the cheapest airline that flies from Illinois to Montana?

Alaska Airlines, Southwest, and Delta are the most popular carriers operating from Illinois to Montana

How many flights depart from Illinois to Montana on average per week?

As of December 2025, there are 3 flights per week flying from Illinois to Montana. The most common day of the week flights depart is Mon, with 33% of flights taking off on this day.

How long is the flight from Illinois to Montana?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into Montana, then you can expect flight times to average 3h 10m and 5h 59m, respectively.

What airlines fly to Montana?

American Airlines, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Montana from Illinois according to our data. American Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Montana. Keep in mind that there are 5 different airlines that fly to Montana on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Montana?

Prices for flights from Illinois to Montana were last updated today.

How many operators does momondo search for flights from Illinois to Montana?

As of December 2025, there are 5 operators available to choose from for flights from Illinois to Montana.

How old do you have to be to fly from Illinois to Montana?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Montana.

What documentation or ID do you need to fly to Montana?

The travel and health documents you'll need for your trip to Montana may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Montana. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$95 Cheap Flights from Illinois to Montana in 2025/26

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Find the cheapest flights from Illinois to Montana

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:00 am - 2:39 pm

ORD

BZN

8h 39m1 stop

3:39 pm - 11:58 pm

BZN

ORD

7h 19m1 stop

$207Hawaiian Airlines

Tue, Mar 24 - Wed, Apr 1

2:50 pm - 11:56 pm

STL

BZN

10h 06m1 stop

7:25 pm - 1:54 pm

BZN

STL

17h 29m1 stop

$210Alaska Airlines

Tue, Jan 13 - Tue, Jan 20

6:45 am - 2:42 pm

STL

BZN

8h 57m1 stop

2:30 pm - 8:58 pm

BZN

STL

5h 28m1 stop

$211United Airlines

Mon, Jan 12 - Sun, Jan 18

6:45 am - 2:42 pm

STL

BZN

8h 57m1 stop

6:15 am - 5:43 pm

BZN

STL

10h 28m2 stops

$216United Airlines

Mon, Jan 12 - Wed, Jan 21

1:18 pm - 5:58 pm

ORD

BZN

5h 40m1 stop

5:20 am - 12:23 pm

BZN

ORD

6h 03m1 stop

$217Delta

Tue, Mar 31 - Wed, Apr 1

2:03 pm - 8:14 pm

MDW

BZN

7h 11m1 stop

5:50 am - 1:23 pm

BZN

MDW

6h 33m1 stop

$217Delta

Tue, Mar 24 - Wed, Apr 1

7:37 pm - 10:02 pm

ORD

BZN

3h 25mnonstop

1:42 pm - 5:49 pm

BZN

ORD

3h 07mnonstop

$230American Airlines

Thu, Jan 29 - Thu, Feb 5

8:25 am - 11:09 am

ORD

BZN

3h 44mnonstop

7:00 am - 11:14 am

BZN

ORD

3h 14mnonstop

$231American Airlines

Sun, Jan 4 - Sat, Jan 10

5:40 am - 10:15 am

MDW

BZN

5h 35m1 stop

4:20 pm - 11:40 pm

BZN

MDW

6h 20m1 stop

$240Southwest

Mon, Apr 6 - Thu, Apr 9

5:00 am - 12:05 pm

STL

BZN

8h 05m1 stop

3:50 pm - 9:45 pm

BZN

STL

4h 55m1 stop

$261Southwest

Fri, Jan 16 - Wed, Jan 21

Alaska Airlines flights from Illinois to Montana

Our best Alaska Airlines deals on Illinois to Montana flight tickets

Alaska Airlines

Jan 13

STL2:50 pmLambert-St Louis

10h 06m

1 stop

BZN11:56 pmBozeman Gallatin Field

Jan 20

BZN7:25 pmBozeman Gallatin Field

17h 29m

1 stop

STL1:54 pmLambert-St Louis

$210

Find similar

Alaska Airlines

Mar 4

ORD5:29 pmChicago O'Hare Intl

7h 27m

1 stop

BZN11:56 pmBozeman Gallatin Field

Mar 7

BZN7:00 amBozeman Gallatin Field

8h 33m

1 stop

ORD4:33 pmChicago O'Hare Intl

$227

Find similar

Alaska Airlines

Mar 3

ORD5:29 pmChicago O'Hare Intl

7h 27m

1 stop

BZN11:56 pmBozeman Gallatin Field

Mar 10

BZN7:00 amBozeman Gallatin Field

8h 33m

1 stop

ORD4:33 pmChicago O'Hare Intl

$228

Find similar

Hawaiian Airlines flights from Illinois to Montana

Our best Hawaiian Airlines deals on Illinois to Montana flight tickets

Hawaiian Airlines

Jan 29

ORD3:35 pmChicago O'Hare Intl

9h 21m

1 stop

BZN11:56 pmBozeman Gallatin Field

Feb 5

BZN3:03 pmBozeman Gallatin Field

7h 47m

1 stop

ORD11:50 pmChicago O'Hare Intl

$215

Find similar

Hawaiian Airlines

Jan 29

ORD3:35 pmChicago O'Hare Intl

9h 21m

1 stop

BZN11:56 pmBozeman Gallatin Field

Feb 5

BZN3:03 pmBozeman Gallatin Field

7h 47m

1 stop

ORD11:50 pmChicago O'Hare Intl

$221

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 3/24

7:00 am-2:39 pm

1 stop8h 39m

Bozeman Gallatin Field

Wed 4/1

3:39 pm-11:58 pm

1 stop7h 19m

$207

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Tue 1/13

2:50 pm-11:56 pm

1 stop10h 06m

Bozeman Gallatin Field

Tue 1/20

7:25 pm-1:54 pm

1 stop17h 29m

$210

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Mon 1/12

6:45 am-2:42 pm

1 stop8h 57m

Bozeman Gallatin Field

Sun 1/18

2:30 pm-8:58 pm

1 stop5h 28m

$211

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Mon 1/12

6:45 am-2:42 pm

1 stop8h 57m

Bozeman Gallatin Field

Wed 1/21

6:15 am-5:43 pm

2 stops10h 28m

$216

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 3/31

1:18 pm-5:58 pm

1 stop5h 40m

Bozeman Gallatin Field

Wed 4/1

5:20 am-12:23 pm

1 stop6h 03m

$217

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Tue 3/24

2:03 pm-8:14 pm

1 stop7h 11m

Bozeman Gallatin Field

Wed 4/1

5:50 am-1:23 pm

1 stop6h 33m

$217

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Thu 1/29

7:37 pm-10:02 pm

Nonstop3h 25m

Bozeman Gallatin Field

Thu 2/5

1:42 pm-5:49 pm

Nonstop3h 07m

$230

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Sun 1/4

8:25 am-11:09 am

Nonstop3h 44m

Bozeman Gallatin Field

Sat 1/10

7:00 am-11:14 am

Nonstop3h 14m

$231

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Mon 4/6

5:40 am-10:15 am

1 stop5h 35m

Bozeman Gallatin Field

Thu 4/9

4:20 pm-11:40 pm

1 stop6h 20m

$240

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Fri 1/16

5:00 am-12:05 pm

1 stop8h 05m

Bozeman Gallatin Field

Wed 1/21

3:50 pm-9:45 pm

1 stop4h 55m

$261

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How to get the cheapest flight ticket from Illinois to Montana

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Montana?

The cheapest month to fly to Montana from Illinois is in September. Flight prices, which tend to average around $302, are often lower during this time because this is during the off-season. The month of August is another great option to travel to Montana, with average flight prices from Illinois averaging around $329.

What is the cheapest day to depart on your flight to Montana?

Our data shows that Tuesday is the least expensive day to fly to Montana. Tickets to fly out on this day can be as low as $320. The most expensive day to fly to Montana is Thursday, with ticket prices averaging around $398.

What is the cheapest time of day to depart on your flight to Montana?

The cheapest time of day to fly to Montana is at noon when flights can be purchased for as low as $290. In the afternoon is when there is more demand to fly to Montana, so prices are often more expensive at around $404 per ticket.

What is the cheapest Illinois to Montana flight route?

Fly from Chicago O'Hare Intl to Bozeman Gallatin Field for the best Illinois - Montana flight prices

How far in advance should I book a flight to Montana?

You are more likely to see cheaper flights to Montana from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Montana for around $388 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Montana from Illinois for as low as $328 on momondo.

What cabin class options are available on Illinois to Montana flights?

There are 4 cabin classes available to choose from on Illinois to Montana flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Montana flights?

You could potentially save up to 22% on your flight if you consider stops on a Illinois to Montana flight.

Cheap Illinois to Montana flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Montana

Best Price Found	$135
Fastest flight time	3h 10m
Direct flights	Every day
Airports in Montana	32 airports

The best one-way flight to Montana from Illinois in the past 72 hours is $135. The best round-trip flight deal from Illinois to Montana found on momondo in the last 72 hours is $285.

The fastest flight from Illinois to Montana takes 3h 10m

Direct flights go from Illinois to Montana every day.

There are 32 airports in Montana. From Illinois there are direct flights to Billings Logan Intl (BIL), Kalispell Glacier Park (FCA), Bozeman Gallatin Field (BZN), Missoula Johnson-Bell Field (MSO).

Search flight deals

When did momondo last update prices for flights from Illinois to Montana?
Prices for flights from Illinois to Montana were last updated today.
How many operators does momondo search for flights from Illinois to Montana?
As of December 2025, there are 5 operators available to choose from for flights from Illinois to Montana.
How old do you have to be to fly from Illinois to Montana?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Montana.
What documentation or ID do you need to fly to Montana?
The travel and health documents you'll need for your trip to Montana may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Montana. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Illinois to Montana?
momondo data reveals that the most frequently booked plane model on the route from Illinois to Montana is Boeing 737-800, representing 43.18% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 15.33%, Embraer 175 at 12.71%, and Embraer 175 (Enhanced Winglets) at 10.75%.

Best airlines flying from Illinois to Montana

Compare and see reviews for airlines that fly from Illinois to Montana with momondo

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $152	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest flights
American Airlines	PriceFrom $211	Free Cancellation	Rating 7.2 11,049 reviews	Search American Airlines flights
United Airlines	PriceFrom $232	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights
Delta	PriceFrom $236	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta flights
Alaska Airlines	PriceFrom $270	Free Cancellation	Rating 8.0 11,469 reviews	Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Montana?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Montana for you.

Can I find flights from Illinois to Montana with flexible booking policies on momondo?

momondo does allow users to show only those flights to Montana from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to Montana?

momondo helps you find the best flight between Illinois and Montana by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to Montana right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Illinois to Montana now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Montana and let you know when they change.

An easier way to manage your Montana trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Popular cities in Montana

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Cheap flights from Illinois to Montana from $104

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Montana departing on 1/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Find the cheapest flights from Illinois to Montana

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Alaska Airlines flights from Illinois to Montana

Our best Alaska Airlines deals on Illinois to Montana flight tickets

Hawaiian Airlines flights from Illinois to Montana

Our best Hawaiian Airlines deals on Illinois to Montana flight tickets

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Use the filters below to find and compare flights from Illinois to Montana that are best for you.

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How to get the cheapest flight ticket from Illinois to Montana

What is the cheapest month to fly to Montana?

What is the cheapest day to depart on your flight to Montana?

Our data shows that Tuesday is the least expensive day to fly to Montana. Tickets to fly out on this day can be as low as $320. The most expensive day to fly to Montana is Thursday, with ticket prices averaging around $398.

What is the cheapest time of day to depart on your flight to Montana?

The cheapest time of day to fly to Montana is at noon when flights can be purchased for as low as $290. In the afternoon is when there is more demand to fly to Montana, so prices are often more expensive at around $404 per ticket.

What is the cheapest Illinois to Montana flight route?

Fly from Chicago O'Hare Intl to Bozeman Gallatin Field for the best Illinois - Montana flight prices

How far in advance should I book a flight to Montana?

What cabin class options are available on Illinois to Montana flights?

There are 4 cabin classes available to choose from on Illinois to Montana flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Montana flights?

You could potentially save up to 22% on your flight if you consider stops on a Illinois to Montana flight.

What is the cheapest airline that flies from Illinois to Montana?

Alaska Airlines, Southwest, and Delta are the most popular carriers operating from Illinois to Montana

What airlines fly to Montana?

How many flights depart from Illinois to Montana on average per week?

As of December 2025, there are 3 flights per week flying from Illinois to Montana. The most common day of the week flights depart is Mon, with 33% of flights taking off on this day.

How long is the flight from Illinois to Montana?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into Montana, then you can expect flight times to average 3h 10m and 5h 59m, respectively.

Cheap Illinois to Montana flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Montana

Best Price Found

Fastest flight time

Direct flights

Airports in Montana

When did momondo last update prices for flights from Illinois to Montana?

How many operators does momondo search for flights from Illinois to Montana?

How old do you have to be to fly from Illinois to Montana?

What documentation or ID do you need to fly to Montana?

What is the most popular plane model from Illinois to Montana?

Best airlines flying from Illinois to Montana

Compare and see reviews for airlines that fly from Illinois to Montana with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Montana?

Can I find flights from Illinois to Montana with flexible booking policies on momondo?

How can momondo help me find flights from Illinois to Montana?

I’m not ready to book a flight from Illinois to Montana right now. Can momondo alert me if prices change?

An easier way to manage your Montana trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Montana

Popular cities in Montana

Popular flights according to clicks in the last 7 days on momondo