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Cheap flights from Illinois to Montana from $129

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 9/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Illinois to Montana

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
3:29 pm - 9:02 pm
STL
-
BZN
6h 33m
1 stop
Delta Logo
6:00 am - 1:34 pm
BZN
-
STL
6h 34m
1 stop
$257Delta
Sat, Aug 15 - Sat, Aug 22
American Airlines Logo
9:32 am - 8:37 pm
STL
-
BZN
12h 05m
2 stops
American Airlines Logo
6:26 am - 4:14 pm
BZN
-
STL
8h 48m
1 stop
$262American Airlines
Wed, Sep 2 - Sat, Sep 5
United Airlines Logo
5:00 am - 9:37 am
ORD
-
BZN
5h 37m
1 stop
United Airlines Logo
4:24 pm - 8:40 pm
BZN
-
ORD
3h 16mnonstop
$295United Airlines
Tue, Jul 28 - Wed, Aug 5
Southwest Logo
6:40 pm - 12:50 am
MDW
-
BZN
7h 10m
1 stop
Southwest Logo
6:40 am - 10:30 am
BZN
-
MDW
2h 50mnonstop
$295Southwest
Tue, Jul 21 - Wed, Jul 29
United Airlines Logo
5:10 am - 9:37 am
STL
-
BZN
5h 27m
1 stop
United Airlines Logo
5:51 pm - 11:57 pm
BZN
-
STL
5h 06m
1 stop
$298United Airlines
Tue, Jul 7 - Fri, Jul 10
Southwest Logo
4:10 pm - 10:00 pm
STL
-
BZN
6h 50m
1 stop
Southwest Logo
6:40 am - 12:35 pm
BZN
-
STL
4h 55m
1 stop
$299Southwest
Sat, Jul 25 - Wed, Jul 29
Alaska Airlines Logo
8:00 am - 2:46 pm
ORD
-
BZN
7h 46m
1 stop
Alaska Airlines Logo
11:16 am - 11:59 pm
BZN
-
ORD
11h 43m
1 stop
$302Alaska Airlines
Fri, Oct 2 - Mon, Oct 5
Multiple Airlines Logo
7:15 am - 9:34 am
ORD
-
MSO
27h 19m
1 stop
Multiple Airlines Logo
10:24 am - 5:37 am
MSO
-
ORD
18h 13m
1 stop
$306Multiple Airlines
Wed, Jul 8 - Thu, Jul 16
Multiple Airlines Logo
7:15 am - 9:34 am
ORD
-
MSO
27h 19m
1 stop
Multiple Airlines Logo
10:24 am - 5:37 am
MSO
-
ORD
18h 13m
1 stop
$312Multiple Airlines
Wed, Jul 8 - Sun, Jul 19
Alaska Airlines Logo
6:00 am - 12:21 pm
STL
-
FCA
7h 21m
1 stop
Alaska Airlines Logo
2:03 pm - 11:59 pm
FCA
-
STL
8h 56m
1 stop
$337Alaska Airlines
Sat, Oct 24 - Wed, Oct 28

American Airlines flights from Illinois to Montana

Our best American Airlines deals on Illinois to Montana flight tickets
American Airlines
Aug 29
STL5:42 amLambert-St Louis
6h 23m
1 stop
BZN11:05 amBozeman Gallatin Field
Sep 5
BZN6:26 amBozeman Gallatin Field
8h 48m
1 stop
STL4:14 pmLambert-St Louis
$271
American Airlines
Sep 2
STL9:32 amLambert-St Louis
12h 05m
2 stops
BZN8:37 pmBozeman Gallatin Field
Sep 5
BZN6:26 amBozeman Gallatin Field
8h 48m
1 stop
STL4:14 pmLambert-St Louis
$276
American Airlines
Jul 5
ORD1:49 pmChicago O'Hare Intl
3h 24m
BZN4:13 pmBozeman Gallatin Field
Jul 14
BZN6:45 amBozeman Gallatin Field
8h 06m
1 stop
ORD3:51 pmChicago O'Hare Intl
$294

United Airlines flights from Illinois to Montana

Our best United Airlines deals on Illinois to Montana flight tickets
United Airlines
Jul 28
ORD5:00 amChicago O'Hare Intl
5h 37m
1 stop
BZN9:37 amBozeman Gallatin Field
Aug 5
BZN4:24 pmBozeman Gallatin Field
3h 16m
ORD8:40 pmChicago O'Hare Intl
$295
United Airlines
Jul 7
STL5:10 amLambert-St Louis
5h 27m
1 stop
BZN9:37 amBozeman Gallatin Field
Jul 10
BZN5:51 pmBozeman Gallatin Field
5h 06m
1 stop
STL11:57 pmLambert-St Louis
$298
United Airlines
Aug 16
ORD5:00 amChicago O'Hare Intl
5h 39m
1 stop
BZN9:39 amBozeman Gallatin Field
Aug 20
BZN2:30 pmBozeman Gallatin Field
7h 16m
1 stop
ORD10:46 pmChicago O'Hare Intl
$300

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Montana 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, momondo users made 832,500 searches. Data last updated June 6, 2026.
Use the filters below to find and compare flights from Illinois to Montana that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Sat 8/15

3:29 pm-9:02 pm

1 stop6h 33m

Bozeman Gallatin Field

Sat 8/22

6:00 am-1:34 pm

1 stop6h 34m

$257

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Wed 9/2

9:32 am-8:37 pm

2 stops12h 05m

Bozeman Gallatin Field

Sat 9/5

6:26 am-4:14 pm

1 stop8h 48m

$262
Quickest round-trip

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Tue 7/28

5:00 am-9:37 am

1 stop5h 37m

Bozeman Gallatin Field

Wed 8/5

4:24 pm-8:40 pm

Nonstop3h 16m

$295

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Tue 7/21

6:40 pm-12:50 am

1 stop7h 10m

Bozeman Gallatin Field

Wed 7/29

6:40 am-10:30 am

Nonstop2h 50m

$295

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Tue 7/7

5:10 am-9:37 am

1 stop5h 27m

Bozeman Gallatin Field

Fri 7/10

5:51 pm-11:57 pm

1 stop5h 06m

$298

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Sat 7/25

4:10 pm-10:00 pm

1 stop6h 50m

Bozeman Gallatin Field

Wed 7/29

6:40 am-12:35 pm

1 stop4h 55m

$299

ChicagoBozeman

ORD - BZN

ORDBZN

Chicago O'Hare Intl

Fri 10/2

8:00 am-2:46 pm

1 stop7h 46m

Bozeman Gallatin Field

Mon 10/5

11:16 am-11:59 pm

1 stop11h 43m

$302

ChicagoMissoula

ORD - MSO

ORDMSO

Chicago O'Hare Intl

Wed 7/8

7:15 am-9:34 am

1 stop27h 19m

Missoula Johnson-Bell Field

Thu 7/16

10:24 am-5:37 am

1 stop18h 13m

$306

ChicagoMissoula

ORD - MSO

ORDMSO

Chicago O'Hare Intl

Wed 7/8

7:15 am-9:34 am

1 stop27h 19m

Missoula Johnson-Bell Field

Sun 7/19

10:24 am-5:37 am

1 stop18h 13m

$312

St. LouisKalispell

STL - FCA

STLFCA

Lambert-St Louis

Sat 10/24

6:00 am-12:21 pm

1 stop7h 21m

Kalispell Glacier Park

Wed 10/28

2:03 pm-11:59 pm

1 stop8h 56m

$337

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Montana from

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

What is the cheapest month to fly to Montana?

The cheapest month to fly to Montana from Illinois is in November. Flight prices, which tend to average around $133, are often lower during this time because this is during the off-season. The month of October is another great option to travel to Montana, with average flight prices from Illinois averaging around $133.

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 $322. The most expensive day to fly to Montana is Thursday, with ticket prices averaging around $374.

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

The cheapest time of day to fly to Montana is in the evening when flights can be purchased for as low as $328. In the afternoon is when there is more demand to fly to Montana, so prices are often more expensive at around $392 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 from Illinois 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 $368 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 $321 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 23% 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

$179

Fastest flight time

3h 05m

Direct flights

Every day

Airports in Montana

32 airports
The best one-way flight to Montana from Illinois in the past 72 hours is $179. The best round-trip flight deal from Illinois to Montana found on momondo in the last 72 hours is $362.
The fastest flight from Illinois to Montana takes 3h 05m
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), Bozeman Gallatin Field (BZN).
Search flight deals

Frequently asked questions about flying from Illinois to Montana

  • 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?

  • 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?

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
SouthwestPriceFrom $210Free CancellationRating
8.0
4,258 reviews
Search Southwest flights
DeltaPriceFrom $216Free CancellationRating
7.8
8,395 reviews
Search Delta flights
American AirlinesPriceFrom $219Free CancellationRating
7.1
11,651 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $226Free CancellationRating
7.9
12,469 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $230Free CancellationRating
7.4
9,775 reviews
Search United 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.

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