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 Billings (a popular airport in Montana) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h on average. If you fly from Bozeman (another popular airport in Montana) to Chicago O'Hare Intl Airport, then the average flight time is 3h 03m.

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

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

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 50% 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.

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

As of June 2026, 146 flights take off from Montana and land in Illinois each week. The most common flight departure day for this route is Thu, with 17% of weekly flights taking off on this day.

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

As of June 2026, 20 flights take off from Montana and land in Illinois each day. The most common flight departure time for this route is 1:00PM, with 90% of daily flights taking off in the afternoon.

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 June 2026.

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.

$143 Cheap Flights from Montana to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

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.

5:20 am - 11:59 am

BIL

ORD

5h 39m

1 stop

3:00 pm - 8:12 pm

ORD

BIL

6h 12m

1 stop

$271Delta

Wed, Aug 12 - Sat, Aug 15

5:20 am - 11:59 am

BIL

ORD

5h 39m

1 stop

1:59 pm - 11:30 pm

ORD

BIL

10h 31m

2 stops

$276Delta

Tue, Aug 11 - Wed, Aug 19

5:03 pm - 9:30 pm

BZN

ORD

3h 27mnonstop

1:49 pm - 4:13 pm

ORD

BZN

3h 24mnonstop

$283American Airlines

Fri, Jul 31 - Sun, Aug 2

5:03 pm - 9:30 pm

BZN

ORD

3h 27mnonstop

1:49 pm - 4:13 pm

ORD

BZN

3h 24mnonstop

$285American Airlines

Wed, Jul 29 - Tue, Aug 4

12:20 pm - 4:15 pm

BZN

MDW

2h 55mnonstop

10:25 am - 12:35 pm

MDW

BZN

3h 10mnonstop

$285Southwest

Fri, Sep 25 - Sun, Sep 27

2:37 pm - 10:46 pm

BZN

ORD

7h 09m

1 stop

9:15 am - 11:45 am

ORD

BZN

3h 30mnonstop

$291United Airlines

Thu, Oct 1 - Sat, Oct 3

2:29 pm - 10:45 pm

BIL

ORD

7h 16m

1 stop

8:40 am - 11:02 am

ORD

BIL

3h 22mnonstop

$292United Airlines

Thu, Aug 27 - Sat, Aug 29

3:30 pm - 10:00 pm

BZN

MDW

5h 30m

1 stop

10:25 am - 12:35 pm

MDW

BZN

3h 10mnonstop

$295Southwest

Fri, Sep 25 - Sun, Sep 27

7:45 pm - 6:20 am

FCA

ORD

9h 35m

1 stop

6:00 am - 12:21 pm

ORD

FCA

7h 21m

1 stop

$329Alaska Airlines

Sat, Oct 24 - Tue, Oct 27

3:46 pm - 11:59 pm

MSO

ORD

7h 13m

1 stop

6:00 am - 2:50 pm

ORD

MSO

9h 50m

1 stop

$329Alaska Airlines

Thu, Oct 22 - Fri, Oct 30

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets

Delta

Aug 12

BIL5:20 amBillings Logan Intl

5h 39m

1 stop

ORD11:59 amChicago O'Hare Intl

Aug 15

ORD4:45 pmChicago O'Hare Intl

7h 08m

1 stop

BIL10:53 pmBillings Logan Intl

$271

Delta

Aug 11

BIL5:20 amBillings Logan Intl

5h 39m

1 stop

ORD11:59 amChicago O'Hare Intl

Aug 19

ORD1:59 pmChicago O'Hare Intl

10h 31m

2 stops

BIL11:30 pmBillings Logan Intl

$276

Delta

Aug 9

BIL5:20 amBillings Logan Intl

5h 39m

1 stop

ORD11:59 amChicago O'Hare Intl

Aug 22

ORD3:00 pmChicago O'Hare Intl

6h 12m

1 stop

BIL8:12 pmBillings Logan Intl

$302

United Airlines flights from Montana to Illinois

Our best United Airlines deals on Montana to Illinois flight tickets

United Airlines

Oct 1

BZN2:37 pmBozeman Gallatin Field

7h 09m

1 stop

ORD10:46 pmChicago O'Hare Intl

Oct 4

ORD4:45 pmChicago O'Hare Intl

3h 27m

BZN7:12 pmBozeman Gallatin Field

$291

United Airlines

Aug 27

BIL2:29 pmBillings Logan Intl

7h 16m

1 stop

ORD10:45 pmChicago O'Hare Intl

Aug 29

ORD8:40 amChicago O'Hare Intl

3h 22m

BIL11:02 amBillings Logan Intl

$292

United Airlines

Sep 11

BZN4:23 pmBozeman Gallatin Field

3h 07m

ORD8:30 pmChicago O'Hare Intl

Sep 13

ORD1:00 pmChicago O'Hare Intl

3h 20m

BZN3:20 pmBozeman Gallatin Field

$299

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 8/12

5:20 am-11:59 am

1 stop5h 39m

Chicago O'Hare Intl

Sat 8/15

3:00 pm-8:12 pm

1 stop6h 12m

$271

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Tue 8/11

5:20 am-11:59 am

1 stop5h 39m

Chicago O'Hare Intl

Wed 8/19

1:59 pm-11:30 pm

2 stops10h 31m

$276

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 7/31

5:03 pm-9:30 pm

Nonstop3h 27m

Chicago O'Hare Intl

Sun 8/2

1:49 pm-4:13 pm

Nonstop3h 24m

$283

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Wed 7/29

5:03 pm-9:30 pm

Nonstop3h 27m

Chicago O'Hare Intl

Tue 8/4

1:49 pm-4:13 pm

Nonstop3h 24m

$285

Quickest round-trip

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Fri 9/25

12:20 pm-4:15 pm

Nonstop2h 55m

Chicago Midway

Sun 9/27

10:25 am-12:35 pm

Nonstop3h 10m

$285

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 10/1

2:37 pm-10:46 pm

1 stop7h 09m

Chicago O'Hare Intl

Sat 10/3

9:15 am-11:45 am

Nonstop3h 30m

$291

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Thu 8/27

2:29 pm-10:45 pm

1 stop7h 16m

Chicago O'Hare Intl

Sat 8/29

8:40 am-11:02 am

Nonstop3h 22m

$292

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Fri 9/25

3:30 pm-10:00 pm

1 stop5h 30m

Chicago Midway

Sun 9/27

10:25 am-12:35 pm

Nonstop3h 10m

$295

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Sat 10/24

7:45 pm-6:20 am

1 stop9h 35m

Chicago O'Hare Intl

Tue 10/27

6:00 am-12:21 pm

1 stop7h 21m

$329

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Thu 10/22

3:46 pm-11:59 pm

1 stop7h 13m

Chicago O'Hare Intl

Fri 10/30

6:00 am-2:50 pm

1 stop9h 50m

$329

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 $129, 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 August is also cheap. Prices for this month can be found on momondo for an average of $133.

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

The cheapest day to depart from Montana to Illinois is on a Thursday when prices can be found for as low as $404. Flights from Montana to Illinois on a Sunday will generally be more expensive and average around $604. 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 $409. Flights in the morning are often more expensive with an average ticket price of $469.

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

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.

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	$201
Fastest flight time	2h 50m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Montana in the past 72 hours is $201. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $348.

The fastest flight from Montana to Illinois takes 2h 50m

Direct flights go from Montana to Illinois every day.

There are 98 airports in Illinois. From Montana there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).

Search flight deals

Frequently asked questions about flying 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 June 2026.
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 MAX 8 (23.07% of total bookings). The next most popular plane models are Boeing 737-800 (22.44%), Embraer 175 (12.09%), and Airbus A320-100/200 (10.35%).

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
Delta	PriceFrom $129	Free Cancellation	Rating 7.8 8,452 reviews	Search Delta flights
Alaska Airlines	PriceFrom $166	Free Cancellation	Rating 7.9 12,581 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $191	Free Cancellation	Rating 7.1 11,778 reviews	Search American Airlines flights
United Airlines	PriceFrom $229	Free Cancellation	Rating 7.4 9,895 reviews	Search United 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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sun 7/26

Sun 8/2

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Illinois

Popular cities

Other flights from Montana

Other flights to Illinois

Airlines

Complete your trip

Feeling lucky

Popular cities in Illinois

Flights to New Yorkfrom $77

Flights to Los Angelesfrom $56

Flights to Orlandofrom $62

Flights to Miamifrom $79

Flights to Chicagofrom $62

Flights to San Franciscofrom $50

Flights to Las Vegasfrom $49

Flights to Washington, D.C.from $55

Flights to Bostonfrom $72

Flights to Atlantafrom $56

Flights to Fort Lauderdalefrom $58

Flights to Dallasfrom $105

Cheap flights from Montana to Illinois from $143

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 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Montana to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

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

momondo Fare Finder

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

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?

What is the cheapest Montana to Illinois flight route?

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

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

What airlines fly to Illinois?

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

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

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

Frequently asked questions about flying 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?

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

Montana flight routes

According to popular flight searches on momondo this year

Illinois flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Illinois

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Complete your trip to Illinois

Explore popular destinations other users love

According to popular flight searches on momondo this year