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Cheap flights from Montana to Illinois from $107

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 4/22. 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 Montana to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
4:20 pm - 11:50 pm
BZN
-
STL
6h 30m
1 stop
Southwest Logo
2:30 pm - 12:15 am
STL
-
BZN
10h 45m
1 stop
$205Southwest
Thu, May 28 - Tue, Jun 2
Southwest Logo
6:15 am - 1:55 pm
BZN
-
ORD
6h 40m
1 stop
Southwest Logo
4:50 pm - 12:15 am
ORD
-
BZN
8h 25m
1 stop
$218Southwest
Mon, May 11 - Tue, May 12
Southwest Logo
1:30 pm - 11:45 pm
BZN
-
STL
9h 15m
1 stop
Southwest Logo
6:55 pm - 12:45 am
STL
-
BZN
6h 50m
1 stop
$227Southwest
Tue, Jun 9 - Tue, Jun 16
Delta Logo
8:00 am - 4:49 pm
BZN
-
ORD
7h 49m
1 stop
Delta Logo
8:05 pm - 11:44 pm
ORD
-
BZN
4h 39m
1 stop
$229Delta
Tue, May 26 - Mon, Jun 1
Delta Logo
2:53 pm - 10:28 pm
BZN
-
MDW
6h 35m
1 stop
Delta Logo
2:12 pm - 8:11 pm
MDW
-
BZN
6h 59m
1 stop
$234Delta
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
6:00 am - 9:51 am
BIL
-
ORD
2h 51mnonstop
American Airlines Logo
8:20 pm - 10:22 pm
ORD
-
BIL
3h 02mnonstop
$251American Airlines
Tue, Sep 1 - Sat, Sep 19
United Airlines Logo
11:43 am - 3:48 pm
BIL
-
ORD
3h 05mnonstop
United Airlines Logo
2:33 pm - 9:00 pm
ORD
-
BIL
7h 27m
1 stop
$261United Airlines
Tue, Sep 1 - Sat, Sep 19
United Airlines Logo
2:25 pm - 9:12 pm
BIL
-
ORD
5h 47m
1 stop
United Airlines Logo
5:00 am - 9:41 am
ORD
-
BIL
5h 41m
1 stop
$290United Airlines
Wed, Sep 16 - Sun, Sep 20
American Airlines Logo
4:45 pm - 9:34 pm
FCA
-
ORD
3h 49mnonstop
American Airlines Logo
9:45 am - 12:35 pm
ORD
-
FCA
3h 50mnonstop
$309American Airlines
Fri, May 29 - Tue, Jun 2
Alaska Airlines Logo
6:36 pm - 2:26 pm
MSO
-
STL
18h 50m
1 stop
Alaska Airlines Logo
6:41 am - 3:23 pm
STL
-
MSO
9h 42m
1 stop
$349Alaska Airlines
Wed, Sep 23 - Sun, Sep 27

American Airlines flights from Montana to Illinois

Our best American Airlines deals on Montana to Illinois flight tickets
American Airlines
Sep 1
BIL6:00 amBillings Logan Intl
2h 51m
ORD9:51 amChicago O'Hare Intl
Sep 19
ORD8:20 pmChicago O'Hare Intl
3h 02m
BIL10:22 pmBillings Logan Intl
$251
American Airlines
Aug 11
BZN4:54 pmBozeman Gallatin Field
3h 09m
ORD9:03 pmChicago O'Hare Intl
Aug 25
ORD1:36 pmChicago O'Hare Intl
3h 14m
BZN3:50 pmBozeman Gallatin Field
$285
American Airlines
May 29
FCA1:25 pmKalispell Glacier Park
3h 39m
ORD6:04 pmChicago O'Hare Intl
Jun 2
ORD9:45 amChicago O'Hare Intl
3h 50m
FCA12:35 pmKalispell Glacier Park
$309

United Airlines flights from Montana to Illinois

Our best United Airlines deals on Montana to Illinois flight tickets
United Airlines
Sep 1
BIL11:43 amBillings Logan Intl
3h 05m
ORD3:48 pmChicago O'Hare Intl
Sep 19
ORD2:33 pmChicago O'Hare Intl
7h 27m
1 stop
BIL9:00 pmBillings Logan Intl
$261
United Airlines
Sep 16
BIL2:25 pmBillings Logan Intl
5h 47m
1 stop
ORD9:12 pmChicago O'Hare Intl
Sep 20
ORD5:00 amChicago O'Hare Intl
5h 41m
1 stop
BIL9:41 amBillings Logan Intl
$290
United Airlines
Apr 24
BZN2:40 pmBozeman Gallatin Field
7h 14m
1 stop
ORD10:54 pmChicago O'Hare Intl
Apr 28
ORD9:05 amChicago O'Hare Intl
3h 26m
BZN11:31 amBozeman Gallatin Field
$291

momondo Fare Finder

 
Customize your flight search to find flights from Montana to Illinois 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 March 28, 2026.
Use the filters below to find and compare flights from Montana to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Thu 5/28

4:20 pm-11:50 pm

1 stop6h 30m

Lambert-St Louis

Tue 6/2

2:30 pm-12:15 am

1 stop10h 45m

$205

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Mon 5/11

6:15 am-1:55 pm

1 stop6h 40m

Chicago O'Hare Intl

Tue 5/12

4:50 pm-12:15 am

1 stop8h 25m

$218

BozemanSt. Louis

BZN - STL

BZNSTL

Bozeman Gallatin Field

Tue 6/9

1:30 pm-11:45 pm

1 stop9h 15m

Lambert-St Louis

Tue 6/16

6:55 pm-12:45 am

1 stop6h 50m

$227

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Tue 5/26

8:00 am-4:49 pm

1 stop7h 49m

Chicago O'Hare Intl

Mon 6/1

8:05 pm-11:44 pm

1 stop4h 39m

$229

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Tue 4/21

2:53 pm-10:28 pm

1 stop6h 35m

Chicago Midway

Tue 4/28

2:12 pm-8:11 pm

1 stop6h 59m

$234
Quickest round-trip

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Tue 9/1

6:00 am-9:51 am

Nonstop2h 51m

Chicago O'Hare Intl

Sat 9/19

8:20 pm-10:22 pm

Nonstop3h 02m

$251

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Tue 9/1

11:43 am-3:48 pm

Nonstop3h 05m

Chicago O'Hare Intl

Sat 9/19

2:33 pm-9:00 pm

1 stop7h 27m

$261

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 9/16

2:25 pm-9:12 pm

1 stop5h 47m

Chicago O'Hare Intl

Sun 9/20

5:00 am-9:41 am

1 stop5h 41m

$290

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Fri 5/29

4:45 pm-9:34 pm

Nonstop3h 49m

Chicago O'Hare Intl

Tue 6/2

9:45 am-12:35 pm

Nonstop3h 50m

$309

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 9/23

6:36 pm-2:26 pm

1 stop18h 50m

Lambert-St Louis

Sun 9/27

6:41 am-3:23 pm

1 stop9h 42m

$349

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 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?

The cheapest month to fly to Illinois from Montana is in September. Flight prices, which tend to average around $229, 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 September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $230.

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 $396. Flights from Montana to Illinois on a Sunday will generally be more expensive and average around $586. 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 at noon. Flights from Montana to Illinois during this time can be as low as $378. Flights in the morning are often more expensive with an average ticket price of $466.

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 $347 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 $202 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?

No. A direct flight is the cheapest option for a flight between 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

$203

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 $203. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $331.
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

  • 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?

  • 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?

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
United AirlinesPriceFrom $187Free CancellationRating
7.4
9,499 reviews
Search United Airlines flights
American AirlinesPriceFrom $191Free CancellationRating
7.1
11,520 reviews
Search American Airlines flights
DeltaPriceFrom $230Free CancellationRating
7.9
8,357 reviews
Search Delta flights
Alaska AirlinesPriceFrom $350Free CancellationRating
7.9
12,133 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

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Find better results for your trip to Illinois

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