How long is the flight from Montana to Illinois?

The flight from Montana to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Bozeman (a popular airport in Montana) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 2h 59m on average. If you fly from Missoula (another popular airport in Montana) to Chicago O'Hare Intl Airport, then the average flight time is 3h 29m.

What airlines fly to Illinois?

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Illinois from Montana according to our data. United Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 4 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

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

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

As of November 2025, 1 flights take off from Montana and land in Illinois each day. The most common flight departure time for this route is 12:00PM, with 90% of daily flights taking off in the afternoon.

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

As of November 2025, 13 flights take off from Montana and land in Illinois each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

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

Prices for flights from Montana to Illinois are refreshed on a daily basis.

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

The number of operators available for flights from Montana to Illinois is 5 as of November 2025.

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

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 Montana to Illinois.

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

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$85 Cheap Flights from Montana to Illinois in 2025/26

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Find the cheapest flights from Montana to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:15 am - 7:05 pmBZN-STL

6h 50m1 stop

5:40 am - 10:20 amSTL-BZN

5h 40m1 stop

$209Southwest

Find Deal

Thu, Jan 8 - Sun, Jan 11

1:34 pm - 5:43 pmBZN-ORD

3h 09mnonstop

5:50 pm - 8:21 pmORD-BZN

3h 31mnonstop

$211American Airlines

Find Deal

Tue, Feb 24 - Fri, Feb 27

5:21 pm - 7:39 pmBIL-ORD

25h 18m1 stop

6:45 pm - 12:05 pmORD-BIL

18h 20m1 stop

$223Multiple Airlines

Find Deal

Mon, Nov 24 - Thu, Nov 27

10:21 am - 1:58 pmMSO-ORD

26h 37m2 stops

10:49 pm - 3:30 pmORD-MSO

17h 41m1 stop

$225Multiple Airlines

Find Deal

Mon, Dec 15 - Sun, Jan 4

3:00 pm - 9:52 pmFCA-ORD

5h 52m1 stop

9:30 am - 1:45 pmORD-FCA

5h 15m1 stop

$229Delta

Find Deal

Tue, Apr 14 - Sat, Apr 18

12:38 pm - 5:10 pmFCA-ORD

3h 32mnonstop

8:45 am - 11:42 amORD-FCA

3h 57mnonstop

$237United Airlines

Find Deal

Thu, Dec 25 - Wed, Dec 31

2:02 pm - 11:50 pmBIL-ORD

8h 48m1 stop

8:00 am - 2:55 pmORD-BIL

7h 55m1 stop

$238Alaska Airlines

Find Deal

Fri, Jan 23 - Mon, Jan 26

7:13 pm - 5:04 amBZN-ORD

8h 51m1 stop

6:50 pm - 10:48 amORD-BZN

16h 58m1 stop

$241Alaska Airlines

Find Deal

Tue, Feb 24 - Fri, Feb 27

6:10 am - 2:55 pmFCA-ORD

7h 45m1 stop

8:45 am - 11:42 amORD-FCA

3h 57mnonstop

$247United Airlines

Find Deal

Thu, Dec 25 - Wed, Dec 31

5:20 am - 12:41 pmFCA-ORD

6h 21m1 stop

7:05 pm - 12:47 amORD-FCA

6h 42m1 stop

$249Delta

Find Deal

Sun, Dec 21 - Fri, Jan 2

Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets

Delta

Apr 14

FCA3:00 pmKalispell Glacier Park

5h 52m

1 stop

ORD9:52 pmChicago O'Hare Intl

Apr 18

ORD9:30 amChicago O'Hare Intl

5h 15m

1 stop

FCA1:45 pmKalispell Glacier Park

$229

Find similar

Delta

Dec 21

FCA5:20 amKalispell Glacier Park

6h 21m

1 stop

ORD12:41 pmChicago O'Hare Intl

Jan 2

ORD7:05 pmChicago O'Hare Intl

6h 42m

1 stop

FCA12:47 amKalispell Glacier Park

$249

Find similar

Delta

Apr 7

BZN6:25 pmBozeman Gallatin Field

5h 12m

1 stop

STL12:37 amLambert-St Louis

Apr 8

STL7:30 amLambert-St Louis

6h 52m

1 stop

BZN1:22 pmBozeman Gallatin Field

$257

Find similar

United Airlines flights from Montana to Illinois

Our best United Airlines deals on Montana to Illinois flight tickets

United Airlines

Dec 25

FCA12:38 pmKalispell Glacier Park

3h 32m

ORD5:10 pmChicago O'Hare Intl

Dec 31

ORD8:45 amChicago O'Hare Intl

3h 57m

FCA11:42 amKalispell Glacier Park

$237

Find similar

United Airlines

Dec 25

FCA6:10 amKalispell Glacier Park

7h 45m

1 stop

ORD2:55 pmChicago O'Hare Intl

Dec 31

ORD8:45 amChicago O'Hare Intl

3h 57m

FCA11:42 amKalispell Glacier Park

$247

Find similar

United Airlines

Dec 3

BIL2:40 pmBillings Logan Intl

5h 28m

1 stop

ORD9:08 pmChicago O'Hare Intl

Dec 10

ORD7:10 amChicago O'Hare Intl

7h 08m

1 stop

BIL1:18 pmBillings Logan Intl

$259

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Thu 1/8

11:15 am-7:05 pm

1 stop6h 50m

Lambert-St Louis

Sun 1/11

5:40 am-10:20 am

1 stop5h 40m

$209

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 2/24

1:34 pm-5:43 pm

Nonstop3h 09m

Chicago O'Hare Intl

Fri 2/27

5:50 pm-8:21 pm

Nonstop3h 31m

$211

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Mon 11/24

5:21 pm-7:39 pm

1 stop25h 18m

Chicago O'Hare Intl

Thu 11/27

6:45 pm-12:05 pm

1 stop18h 20m

$223

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Mon 12/15

10:21 am-1:58 pm

2 stops26h 37m

Chicago O'Hare Intl

Sun 1/4

10:49 pm-3:30 pm

1 stop17h 41m

$225

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Tue 4/14

3:00 pm-9:52 pm

1 stop5h 52m

Chicago O'Hare Intl

Sat 4/18

9:30 am-1:45 pm

1 stop5h 15m

$229

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Thu 12/25

12:38 pm-5:10 pm

Nonstop3h 32m

Chicago O'Hare Intl

Wed 12/31

8:45 am-11:42 am

Nonstop3h 57m

$237

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Fri 1/23

2:02 pm-11:50 pm

1 stop8h 48m

Chicago O'Hare Intl

Mon 1/26

8:00 am-2:55 pm

1 stop7h 55m

$238

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 2/24

7:13 pm-5:04 am

1 stop8h 51m

Chicago O'Hare Intl

Fri 2/27

6:50 pm-10:48 am

1 stop16h 58m

$241

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Thu 12/25

6:10 am-2:55 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 12/31

8:45 am-11:42 am

Nonstop3h 57m

$247

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Sun 12/21

5:20 am-12:41 pm

1 stop6h 21m

Chicago O'Hare Intl

Fri 1/2

7:05 pm-12:47 am

1 stop6h 42m

$249

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Montana to Illinois

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 Illinois?

The cheapest month to fly to Illinois from Montana is in July. Flight prices, which tend to average around $289, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of July, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $295.

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

The cheapest day to depart from Montana to Illinois is on a Wednesday when prices can be found for as low as $456. Flights from Montana to Illinois on a Monday will generally be more expensive and average around $639. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Montana to Illinois during this time can be as low as $389. Flights in the morning are often more expensive with an average ticket price of $533.

What is the cheapest Montana to Illinois flight route?

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

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

You are more likely to see cheaper flights to Illinois from Montana when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $403 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Montana for as low as $247 on momondo.

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

There are 4 cabin classes available to choose from on Montana to Illinois 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 Montana to Illinois flights?

You could potentially save up to 29% on your flight if you consider stops on a Montana to Illinois flight.

Cheap Montana to Illinois flight deals and tips

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

Best Price Found	$210
Fastest flight time	2h 57m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from Montana in the past 72 hours is $210. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $301.

The fastest flight from Montana to Illinois takes 2h 57m

Direct flights go from Montana to Illinois every day.

There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)

Search flight deals

When did momondo last update prices for flights from Montana to Illinois?
Prices for flights from Montana to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Montana to Illinois?
The number of operators available for flights from Montana to Illinois is 5 as of November 2025.
How old do you have to be to fly from Montana to Illinois?
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 Montana to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Montana to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Montana to Illinois is Boeing 737-800 (28.17% of total bookings). The next most popular plane models are Embraer 175 (25.96%), Boeing 737 MAX 8 (13.27%), and Embraer 175 (Enhanced Winglets) (11.65%).

Best airlines flying from Montana to Illinois

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

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $191	Free Cancellation	Rating 7.2 11,040 reviews	Search American Airlines flights
United Airlines	PriceFrom $229	Free Cancellation	Rating 7.4 9,007 reviews	Search United Airlines flights
Delta	PriceFrom $236	Free Cancellation	Rating 7.9 8,001 reviews	Search Delta flights
Alaska Airlines	PriceFrom $349	Free Cancellation	Rating 8.0 11,247 reviews	Search Alaska Airlines flights

Why use momondo?

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

Finding the right flight to Illinois from Montana is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

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

Flights from Montana to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Illinois from Montana. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Illinois from Montana. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Illinois 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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Find better results for your trip to Illinois

Popular cities in Illinois

Flights to New Yorkfrom $44

Flights to Los Angelesfrom $49

Flights to Miamifrom $49

Flights to Chicagofrom $54

Flights to Orlandofrom $49

Flights to Las Vegasfrom $42

Flights to San Franciscofrom $57

Flights to Washington, D.C.from $49

Flights to Bostonfrom $49

Flights to Atlantafrom $40

Flights to Dallasfrom $59

Flights to Seattlefrom $58

Montana flight routes

Flights from Bozeman Gallatin Field to Las Vegas Harry Reid Intl

Flights from Great Falls to Las Vegas Harry Reid Intl

Flights from Missoula Johnson-Bell Field to Las Vegas Harry Reid Intl

Flights from Kalispell Glacier Park to Las Vegas Harry Reid Intl

Flights from Billings Logan Intl to Las Vegas Harry Reid Intl

Flights from Bozeman Gallatin Field to Boise Air Term. Gowen Fld

Cheap flights from Montana to Illinois from $85

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montana to Illinois departing on 2/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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Price Alerts

Find the cheapest flights from Montana to Illinois

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Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets

United Airlines flights from Montana to Illinois

Our best United Airlines deals on Montana to Illinois flight tickets

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How to get the cheapest flight ticket from Montana to Illinois

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

What is the cheapest month to fly to Illinois?

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

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

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Montana to Illinois during this time can be as low as $389. Flights in the morning are often more expensive with an average ticket price of $533.

What is the cheapest Montana to Illinois flight route?

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

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

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

There are 4 cabin classes available to choose from on Montana to Illinois 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 Montana to Illinois flights?

You could potentially save up to 29% on your flight if you consider stops on a Montana to Illinois flight.

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

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

What airlines fly to Illinois?

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

As of November 2025, 1 flights take off from Montana and land in Illinois each day. The most common flight departure time for this route is 12:00PM, with 90% of daily flights taking off in the afternoon.

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

As of November 2025, 13 flights take off from Montana and land in Illinois each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

How long is the flight from Montana to Illinois?

Cheap Montana to Illinois flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

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

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

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

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

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

Best airlines flying from Montana to Illinois

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

Why use momondo?

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

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

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

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

An easier way to manage your Illinois 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 Illinois

Popular cities in Illinois

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