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 Billings (another popular airport in Montana) to Chicago O'Hare Intl Airport, then the average flight time is 3h.

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

As of September 2025, 26 flights take off from Montana and land in Illinois each day. The most common flight departure time for this route is 12:00PM, with 75% of daily flights taking off in the afternoon.

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 43% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

As of September 2025, 185 flights take off from Montana and land in Illinois each week. The most common flight departure day for this route is Mon, with 16% of weekly flights taking off on this day.

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

Alaska Airlines, Hawaiian Airlines, and Frontier are the most popular carriers operating from Montana to Illinois

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 September 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.

$110 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

1:05 pm - 5:35 pmMSO-ORD

3h 30mnonstop

9:45 am - 12:25 pmORD-MSO

3h 40mnonstop

$191American Airlines

Find Deal

Wed, Jan 21 - Mon, Jan 26

5:45 am - 1:04 pmMSO-ORD

6h 19m1 stop

7:45 am - 1:52 pmORD-MSO

7h 07m1 stop

$210Alaska Airlines

Find Deal

Wed, Jan 21 - Mon, Jan 26

3:04 pm - 11:59 pmBZN-ORD

7h 55m1 stop

7:00 am - 1:02 pmORD-BZN

7h 02m1 stop

$228Hawaiian Airlines

Find Deal

Thu, Oct 23 - Mon, Oct 27

5:30 am - 12:26 pmMSO-ORD

5h 56m1 stop

3:50 pm - 8:17 pmORD-MSO

5h 27m1 stop

$237Delta

Find Deal

Wed, Jan 21 - Mon, Jan 26

5:30 am - 12:26 pmMSO-ORD

5h 56m1 stop

10:35 am - 8:17 pmORD-MSO

10h 42m2 stops

$242Delta

Find Deal

Wed, Jan 21 - Mon, Jan 26

8:00 am - 12:05 pmBZN-ORD

3h 05mnonstop

9:15 am - 11:43 amORD-BZN

3h 28mnonstop

$249United Airlines

Find Deal

Thu, Oct 23 - Mon, Oct 27

2:28 pm - 9:30 pmBZN-ORD

6h 02m1 stop

9:15 am - 11:43 amORD-BZN

3h 28mnonstop

$259United Airlines

Find Deal

Thu, Oct 23 - Mon, Oct 27

1:59 pm - 12:24 amMSO-ORD

9h 25m1 stop

3:25 pm - 11:43 pmORD-MSO

9h 18m1 stop

$269Hawaiian Airlines

Find Deal

Sat, Nov 8 - Wed, Nov 12

8:00 pm - 5:15 amBZN-MDW

8h 15m1 stop

10:45 pm - 9:50 amMDW-BZN

12h 05m1 stop

$285Southwest

Find Deal

Thu, Oct 23 - Sun, Oct 26

5:00 am - 2:25 pmBZN-MDW

8h 25m2 stops

5:15 am - 9:35 amMDW-BZN

5h 20m1 stop

$345Southwest

Find Deal

Thu, Oct 30 - Sun, Nov 2

Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets

Delta

Jan 21

MSO5:30 amMissoula Johnson-Bell Field

5h 56m

1 stop

ORD12:26 pmChicago O'Hare Intl

Jan 26

ORD3:50 pmChicago O'Hare Intl

5h 27m

1 stop

MSO8:17 pmMissoula Johnson-Bell Field

$237

Find similar

Delta

Jan 21

MSO5:30 amMissoula Johnson-Bell Field

5h 56m

1 stop

ORD12:26 pmChicago O'Hare Intl

Jan 26

ORD10:35 amChicago O'Hare Intl

10h 42m

2 stops

MSO8:17 pmMissoula Johnson-Bell Field

$242

Find similar

Delta

Jan 21

MSO8:00 amMissoula Johnson-Bell Field

11h 38m

2 stops

ORD8:38 pmChicago O'Hare Intl

Jan 26

ORD10:35 amChicago O'Hare Intl

10h 42m

2 stops

MSO8:17 pmMissoula Johnson-Bell Field

$247

Find similar

American Airlines flights from Montana to Illinois

Our best American Airlines deals on Montana to Illinois flight tickets

American Airlines

Jan 21

MSO1:05 pmMissoula Johnson-Bell Field

3h 30m

ORD5:35 pmChicago O'Hare Intl

Jan 26

ORD9:45 amChicago O'Hare Intl

3h 40m

MSO12:25 pmMissoula Johnson-Bell Field

$191

Find similar

American Airlines

Jan 9

MSO1:05 pmMissoula Johnson-Bell Field

3h 30m

ORD5:35 pmChicago O'Hare Intl

Jan 18

ORD9:45 amChicago O'Hare Intl

3h 40m

MSO12:25 pmMissoula Johnson-Bell Field

$220

Find similar

American Airlines

Oct 25

BIL12:20 pmBillings Logan Intl

2h 57m

ORD4:17 pmChicago O'Hare Intl

Oct 29

ORD9:40 amChicago O'Hare Intl

3h 10m

BIL11:50 amBillings Logan Intl

$229

Find similar

Fly from

Fly to

Route

Depart

Return

Price

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Wed 1/21

1:05 pm-5:35 pm

Nonstop3h 30m

Chicago O'Hare Intl

Mon 1/26

9:45 am-12:25 pm

Nonstop3h 40m

$191

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Wed 1/21

5:45 am-1:04 pm

1 stop6h 19m

Chicago O'Hare Intl

Mon 1/26

7:45 am-1:52 pm

1 stop7h 07m

$210

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 10/23

3:04 pm-11:59 pm

1 stop7h 55m

Chicago O'Hare Intl

Mon 10/27

7:00 am-1:02 pm

1 stop7h 02m

$228

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Wed 1/21

5:30 am-12:26 pm

1 stop5h 56m

Chicago O'Hare Intl

Mon 1/26

3:50 pm-8:17 pm

1 stop5h 27m

$237

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Wed 1/21

5:30 am-12:26 pm

1 stop5h 56m

Chicago O'Hare Intl

Mon 1/26

10:35 am-8:17 pm

2 stops10h 42m

$242

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 10/23

8:00 am-12:05 pm

Nonstop3h 05m

Chicago O'Hare Intl

Mon 10/27

9:15 am-11:43 am

Nonstop3h 28m

$249

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 10/23

2:28 pm-9:30 pm

1 stop6h 02m

Chicago O'Hare Intl

Mon 10/27

9:15 am-11:43 am

Nonstop3h 28m

$259

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Sat 11/8

1:59 pm-12:24 am

1 stop9h 25m

Chicago O'Hare Intl

Wed 11/12

3:25 pm-11:43 pm

1 stop9h 18m

$269

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 10/23

8:00 pm-5:15 am

1 stop8h 15m

Chicago Midway

Sun 10/26

10:45 pm-9:50 am

1 stop12h 05m

$285

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 10/30

5:00 am-2:25 pm

2 stops8h 25m

Chicago Midway

Sun 11/2

5:15 am-9:35 am

1 stop5h 20m

$345

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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

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 $302.

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 $464. Flights from Montana to Illinois on a Sunday will generally be more expensive and average around $667. 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 $374. Flights in the morning are often more expensive with an average ticket price of $554.

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 $410 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 1% 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	$190
Fastest flight time	2h 54m
Direct flights	Every day
Airports in Illinois	2 airports

The best one-way flight to Illinois from Montana in the past 72 hours is $190. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $290.

The fastest flight from Montana to Illinois takes 2h 54m

Direct flights go from Montana to Illinois every day.

There are 2 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW)

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 September 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 (34.39% of total bookings). The next most popular plane models are Embraer 175 (18.35%), Embraer 175 (Enhanced Winglets) (13.57%), and Boeing 737 MAX 8 (12.34%).

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 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $236	Free Cancellation	Rating 7.9 7,964 reviews	Search Delta flights
United Airlines	PriceFrom $239	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $267	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $388	Free Cancellation	Rating 8.0 4,242 reviews	Search Southwest 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 $49

Flights to Los Angelesfrom $49

Flights to Miamifrom $49

Flights to Chicagofrom $47

Flights to Orlandofrom $60

Flights to Las Vegasfrom $48

Flights to San Franciscofrom $53

Flights to Washington, D.C.from $49

Flights to Bostonfrom $73

Flights to Atlantafrom $51

Flights to Dallasfrom $56

Flights to Seattlefrom $86

Montana flight routes

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

Flights from Great Falls to Las Vegas Harry Reid Intl

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

Flights from Bozeman Gallatin Field to Las Vegas Harry Reid Intl

Flights from Kalispell Glacier Park to Las Vegas Harry Reid Intl

Flights from Bozeman Gallatin Field to Nashville Intl

Cheap flights from Montana to Illinois from $110

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 10/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

Cheap round-trip flights

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Cheap last minute flights

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Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets

American Airlines flights from Montana to Illinois

Our best American Airlines deals on Montana to Illinois flight tickets

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

See travel insights to Illinois from

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 $374. Flights in the morning are often more expensive with an average ticket price of $554.

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 1% 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, Hawaiian Airlines, and Frontier 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 September 2025, 26 flights take off from Montana and land in Illinois each day. The most common flight departure time for this route is 12:00PM, with 75% of daily flights taking off in the afternoon.

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

As of September 2025, 185 flights take off from Montana and land in Illinois each week. The most common flight departure day for this route is Mon, with 16% 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