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Cheap flights from Illinois to Montana from $125

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 5/12. 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
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.
United Airlines Logo
7:52 pm - 10:15 pm
ORD
-
BIL
3h 23mnonstop
United Airlines Logo
6:00 pm - 12:44 am
BIL
-
ORD
5h 44m
1 stop
$261United Airlines
Wed, Jun 10 - Wed, Jun 17
American Airlines Logo
9:55 am - 11:58 am
ORD
-
BIL
3h 03mnonstop
American Airlines Logo
12:28 pm - 4:19 pm
BIL
-
ORD
2h 51mnonstop
$270American Airlines
Thu, Sep 3 - Tue, Sep 8
Delta Logo
5:41 pm - 11:14 pm
ORD
-
BIL
6h 33m
1 stop
Delta Logo
6:30 am - 11:47 am
BIL
-
ORD
4h 17m
1 stop
$271Delta
Tue, May 26 - Wed, Jun 3
Delta Logo
7:59 pm - 11:59 pm
STL
-
BZN
5h 00m
1 stop
Delta Logo
6:35 pm - 12:30 am
BZN
-
STL
4h 55m
1 stop
$271Delta
Tue, May 26 - Mon, Jun 1
American Airlines Logo
9:55 am - 11:58 am
ORD
-
BIL
3h 03mnonstop
American Airlines Logo
12:28 pm - 4:19 pm
BIL
-
ORD
2h 51mnonstop
$272American Airlines
Thu, Sep 3 - Tue, Sep 8
Delta Logo
3:47 pm - 10:52 pm
ORD
-
BIL
8h 05m
2 stops
Delta Logo
6:30 am - 11:47 am
BIL
-
ORD
4h 17m
1 stop
$276Delta
Wed, May 27 - Wed, Jun 3
United Airlines Logo
7:52 pm - 10:15 pm
ORD
-
BIL
3h 23mnonstop
United Airlines Logo
4:10 pm - 10:49 pm
BIL
-
ORD
5h 39m
1 stop
$280United Airlines
Thu, May 28 - Tue, Jun 2
Southwest Logo
10:50 am - 12:55 pm
MDW
-
BZN
3h 05mnonstop
Southwest Logo
7:10 am - 11:05 am
BZN
-
MDW
2h 55mnonstop
$285Southwest
Mon, Aug 17 - Sat, Aug 22
Southwest Logo
9:00 am - 3:30 pm
MDW
-
BZN
7h 30m
1 stop
Southwest Logo
7:35 am - 11:25 am
BZN
-
MDW
2h 50mnonstop
$295Southwest
Sat, Jul 4 - Fri, Jul 10
Alaska Airlines Logo
3:52 pm - 10:56 pm
ORD
-
FCA
8h 04m
1 stop
Alaska Airlines Logo
8:21 pm - 6:22 am
FCA
-
ORD
9h 01m
1 stop
$329Alaska Airlines
Tue, Sep 22 - Sat, Sep 26

Alaska Airlines flights from Illinois to Montana

Our best Alaska Airlines deals on Illinois to Montana flight tickets
Alaska Airlines
May 15
ORD7:59 pmChicago O'Hare Intl
19h 15m
1 stop
BZN2:14 pmBozeman Gallatin Field
May 18
BZN7:59 pmBozeman Gallatin Field
9h 21m
1 stop
ORD6:20 amChicago O'Hare Intl
$321
Alaska Airlines
May 15
ORD2:10 pmChicago O'Hare Intl
25h 04m
1 stop
BZN2:14 pmBozeman Gallatin Field
May 17
BZN7:59 pmBozeman Gallatin Field
9h 21m
1 stop
ORD6:20 amChicago O'Hare Intl
$325
Alaska Airlines
Sep 22
ORD3:52 pmChicago O'Hare Intl
8h 04m
1 stop
FCA10:56 pmKalispell Glacier Park
Sep 26
FCA8:21 pmKalispell Glacier Park
9h 01m
1 stop
ORD6:22 amChicago O'Hare Intl
$329

American Airlines flights from Illinois to Montana

Our best American Airlines deals on Illinois to Montana flight tickets
American Airlines
Sep 3
ORD9:55 amChicago O'Hare Intl
3h 03m
BIL11:58 amBillings Logan Intl
Sep 8
BIL12:28 pmBillings Logan Intl
2h 51m
ORD4:19 pmChicago O'Hare Intl
$270
American Airlines
Sep 3
ORD9:55 amChicago O'Hare Intl
3h 03m
BIL11:58 amBillings Logan Intl
Sep 8
BIL12:28 pmBillings Logan Intl
2h 51m
ORD4:19 pmChicago O'Hare Intl
$272
American Airlines
Jul 11
ORD1:49 pmChicago O'Hare Intl
3h 19m
BZN4:08 pmBozeman Gallatin Field
Jul 18
BZN4:58 pmBozeman Gallatin Field
3h 31m
ORD9:29 pmChicago O'Hare Intl
$285

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 April 14, 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

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Wed 6/10

7:52 pm-10:15 pm

Nonstop3h 23m

Billings Logan Intl

Wed 6/17

6:00 pm-12:44 am

1 stop5h 44m

$261
Quickest round-trip

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Thu 9/3

9:55 am-11:58 am

Nonstop3h 03m

Billings Logan Intl

Tue 9/8

12:28 pm-4:19 pm

Nonstop2h 51m

$270

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Tue 5/26

5:41 pm-11:14 pm

1 stop6h 33m

Billings Logan Intl

Wed 6/3

6:30 am-11:47 am

1 stop4h 17m

$271

St. LouisBozeman

STL - BZN

STLBZN

Lambert-St Louis

Tue 5/26

7:59 pm-11:59 pm

1 stop5h 00m

Bozeman Gallatin Field

Mon 6/1

6:35 pm-12:30 am

1 stop4h 55m

$271

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Thu 9/3

9:55 am-11:58 am

Nonstop3h 03m

Billings Logan Intl

Tue 9/8

12:28 pm-4:19 pm

Nonstop2h 51m

$272

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Wed 5/27

3:47 pm-10:52 pm

2 stops8h 05m

Billings Logan Intl

Wed 6/3

6:30 am-11:47 am

1 stop4h 17m

$276

ChicagoBillings

ORD - BIL

ORDBIL

Chicago O'Hare Intl

Thu 5/28

7:52 pm-10:15 pm

Nonstop3h 23m

Billings Logan Intl

Tue 6/2

4:10 pm-10:49 pm

1 stop5h 39m

$280

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Mon 8/17

10:50 am-12:55 pm

Nonstop3h 05m

Bozeman Gallatin Field

Sat 8/22

7:10 am-11:05 am

Nonstop2h 55m

$285

ChicagoBozeman

MDW - BZN

MDWBZN

Chicago Midway

Sat 7/4

9:00 am-3:30 pm

1 stop7h 30m

Bozeman Gallatin Field

Fri 7/10

7:35 am-11:25 am

Nonstop2h 50m

$295

ChicagoKalispell

ORD - FCA

ORDFCA

Chicago O'Hare Intl

Tue 9/22

3:52 pm-10:56 pm

1 stop8h 04m

Kalispell Glacier Park

Sat 9/26

8:21 pm-6:22 am

1 stop9h 01m

$329

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 January. Flight prices, which tend to average around $309, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Montana, with average flight prices from Illinois averaging around $313.

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 $310. The most expensive day to fly to Montana is Thursday, with ticket prices averaging around $367.

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 $308. In the afternoon is when there is more demand to fly to Montana, so prices are often more expensive at around $391 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 $370 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 $296 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 28% 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

$182

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 $182. The best round-trip flight deal from Illinois to Montana found on momondo in the last 72 hours is $299.
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
American AirlinesPriceFrom $210Free CancellationRating
7.1
11,574 reviews
Search American Airlines flights
SouthwestPriceFrom $210Free CancellationRating
8.0
4,328 reviews
Search Southwest flights
DeltaPriceFrom $216Free CancellationRating
7.9
8,405 reviews
Search Delta flights
Alaska AirlinesPriceFrom $226Free CancellationRating
7.9
12,233 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $230Free CancellationRating
7.4
9,581 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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