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Cheap flights from Montana to Illinois from $99

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 9/28. 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
2:30 pm - 11:50 pmBZN  Bozeman Gallatin Field-MDW Chicago Midway
8h 20m1 stop San Diego
Southwest Logo
10:50 am - 12:55 pmMDW  Chicago Midway-BZN Bozeman Gallatin Field
3h 05mnonstop
$199Southwest
Thu, Sep 24 - Mon, Sep 28
Southwest Logo
7:20 am - 5:00 pmBZN  Bozeman Gallatin Field-MDW Chicago Midway
8h 40m2 stops Las Vegas Harry Reid Intl Wichita Eisenhower National
Southwest Logo
10:50 am - 12:55 pmMDW  Chicago Midway-BZN Bozeman Gallatin Field
3h 05mnonstop
$205Southwest
Thu, Sep 24 - Mon, Sep 28
Delta Logo
3:40 pm - 11:46 pmBZN  Bozeman Gallatin Field-ORD Chicago O'Hare Intl
7h 06m1 stop Seattle/Tacoma Intl
Delta Logo
6:59 pm - 12:10 amORD  Chicago O'Hare Intl-BZN Bozeman Gallatin Field
6h 11m1 stop Salt Lake City
$217Delta
Mon, Jan 25 - Tue, Jan 26
Delta Logo
8:25 am - 6:00 pmBZN  Bozeman Gallatin Field-ORD Chicago O'Hare Intl
8h 35m1 stop Seattle/Tacoma Intl
Delta Logo
6:40 am - 1:38 pmORD  Chicago O'Hare Intl-BZN Bozeman Gallatin Field
7h 58m1 stop Atlanta Hartsfield-Jackson
$217Delta
Sat, Sep 26 - Sat, Oct 3
United Airlines Logo
2:28 pm - 9:52 pmBIL  Billings Logan Intl-ORD Chicago O'Hare Intl
6h 24m1 stop Denver Intl
United Airlines Logo
5:00 am - 9:46 amORD  Chicago O'Hare Intl-BIL Billings Logan Intl
5h 46m1 stop Denver Intl
$292United Airlines
Sat, Sep 26 - Wed, Sep 30
United Airlines Logo
12:53 pm - 5:00 pmBZN  Bozeman Gallatin Field-ORD Chicago O'Hare Intl
3h 07mnonstop
United Airlines Logo
9:07 am - 11:45 amORD  Chicago O'Hare Intl-BZN Bozeman Gallatin Field
3h 38mnonstop
$295United Airlines
Fri, Oct 23 - Mon, Oct 26
American Airlines Logo
1:15 pm - 5:29 pmBZN  Bozeman Gallatin Field-ORD Chicago O'Hare Intl
3h 14mnonstop
American Airlines Logo
9:58 am - 12:25 pmORD  Chicago O'Hare Intl-BZN Bozeman Gallatin Field
3h 27mnonstop
$295American Airlines
Thu, Oct 8 - Mon, Oct 12
American Airlines Logo
1:43 pm - 5:52 pmBZN  Bozeman Gallatin Field-ORD Chicago O'Hare Intl
3h 09mnonstop
American Airlines Logo
10:16 am - 12:43 pmORD  Chicago O'Hare Intl-BZN Bozeman Gallatin Field
3h 27mnonstop
$295American Airlines
Thu, Sep 17 - Mon, Sep 21
Alaska Airlines Logo
7:03 am - 5:37 pmMSO  Missoula Johnson-Bell Field-ORD Chicago O'Hare Intl
9h 34m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
9:30 am - 9:18 pmORD  Chicago O'Hare Intl-MSO Missoula Johnson-Bell Field
12h 48m1 stop Seattle/Tacoma Intl
$339Alaska Airlines
Thu, Nov 12 - Sun, Nov 15
Alaska Airlines Logo
4:16 pm - 11:59 pmMSO  Missoula Johnson-Bell Field-ORD Chicago O'Hare Intl
6h 43m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
8:00 am - 3:17 pmORD  Chicago O'Hare Intl-MSO Missoula Johnson-Bell Field
8h 17m1 stop Seattle/Tacoma Intl
$339Alaska Airlines
Fri, Sep 25 - Tue, Sep 29

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American Airlines flights from Montana to Illinois

Our best American Airlines deals on Montana to Illinois flight tickets
American Airlines
Sep 17
BZN1:43 pmBozeman Gallatin Field
3h 09m
ORD5:52 pmChicago O'Hare Intl
Sep 21
ORD10:16 amChicago O'Hare Intl
3h 27m
BZN12:43 pmBozeman Gallatin Field
$295
American Airlines
Sep 11
BZN4:16 pmBozeman Gallatin Field
6h 58m
1 stop
ORD12:14 amChicago O'Hare Intl
Sep 21
ORD10:16 amChicago O'Hare Intl
3h 27m
BZN12:43 pmBozeman Gallatin Field
$305
American Airlines
Sep 24
BZN4:16 pmBozeman Gallatin Field
6h 58m
1 stop
ORD12:14 amChicago O'Hare Intl
Sep 28
ORD10:16 amChicago O'Hare Intl
3h 27m
BZN12:43 pmBozeman Gallatin Field
$306

Alaska Airlines flights from Montana to Illinois

Our best Alaska Airlines deals on Montana to Illinois flight tickets
Alaska Airlines
Nov 7
MSO2:02 pmMissoula Johnson-Bell Field
8h 57m
1 stop
ORD11:59 pmChicago O'Hare Intl
Nov 10
ORD7:00 amChicago O'Hare Intl
9h 27m
1 stop
MSO3:27 pmMissoula Johnson-Bell Field
$369
Alaska Airlines
Oct 1
MSO4:16 pmMissoula Johnson-Bell Field
6h 43m
1 stop
ORD11:59 pmChicago O'Hare Intl
Oct 5
ORD6:00 amChicago O'Hare Intl
9h 50m
1 stop
MSO2:50 pmMissoula Johnson-Bell Field
$399
Alaska Airlines
Aug 28
BZN9:20 amBozeman Gallatin Field
9h 01m
1 stop
ORD7:21 pmChicago O'Hare Intl
Sep 5
ORD1:03 pmChicago O'Hare Intl
10h 56m
1 stop
BZN10:59 pmBozeman Gallatin Field
$406

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 August 14, 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

BozemanChicago

BZN Bozeman Gallatin Field - MDW Chicago Midway

BZNMDW

Bozeman Gallatin Field

Thu 9/24

2:30 pm-11:50 pm

1 stop8h 20m

Chicago Midway

Mon 9/28

10:50 am-12:55 pm

Nonstop3h 05m

$199

BozemanChicago

BZN Bozeman Gallatin Field - MDW Chicago Midway

BZNMDW

Bozeman Gallatin Field

Thu 9/24

7:20 am-5:00 pm

2 stops8h 40m

Chicago Midway

Mon 9/28

10:50 am-12:55 pm

Nonstop3h 05m

$205

BozemanChicago

BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl

BZNORD

Bozeman Gallatin Field

Mon 1/25

3:40 pm-11:46 pm

1 stop7h 06m

Chicago O'Hare Intl

Tue 1/26

6:59 pm-12:10 am

1 stop6h 11m

$217

BozemanChicago

BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl

BZNORD

Bozeman Gallatin Field

Sat 9/26

8:25 am-6:00 pm

1 stop8h 35m

Chicago O'Hare Intl

Sat 10/3

6:40 am-1:38 pm

1 stop7h 58m

$217

BillingsChicago

BIL Billings Logan Intl - ORD Chicago O'Hare Intl

BILORD

Billings Logan Intl

Sat 9/26

2:28 pm-9:52 pm

1 stop6h 24m

Chicago O'Hare Intl

Wed 9/30

5:00 am-9:46 am

1 stop5h 46m

$292

BozemanChicago

BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl

BZNORD

Bozeman Gallatin Field

Fri 10/23

12:53 pm-5:00 pm

Nonstop3h 07m

Chicago O'Hare Intl

Mon 10/26

9:07 am-11:45 am

Nonstop3h 38m

$295

BozemanChicago

BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl

BZNORD

Bozeman Gallatin Field

Thu 10/8

1:15 pm-5:29 pm

Nonstop3h 14m

Chicago O'Hare Intl

Mon 10/12

9:58 am-12:25 pm

Nonstop3h 27m

$295
Quickest round-trip

BozemanChicago

BZN Bozeman Gallatin Field - ORD Chicago O'Hare Intl

BZNORD

Bozeman Gallatin Field

Thu 9/17

1:43 pm-5:52 pm

Nonstop3h 09m

Chicago O'Hare Intl

Mon 9/21

10:16 am-12:43 pm

Nonstop3h 27m

$295

MissoulaChicago

MSO Missoula Johnson-Bell Field - ORD Chicago O'Hare Intl

MSOORD

Missoula Johnson-Bell Field

Thu 11/12

7:03 am-5:37 pm

1 stop9h 34m

Chicago O'Hare Intl

Sun 11/15

9:30 am-9:18 pm

1 stop12h 48m

$339

MissoulaChicago

MSO Missoula Johnson-Bell Field - ORD Chicago O'Hare Intl

MSOORD

Missoula Johnson-Bell Field

Fri 9/25

4:16 pm-11:59 pm

1 stop6h 43m

Chicago O'Hare Intl

Tue 9/29

8:00 am-3:17 pm

1 stop8h 17m

$339

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 January. Flight prices, which tend to average around $310, 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 January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $331.

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 $421. Flights from Montana to Illinois on a Monday will generally be more expensive and average around $591. 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 $430. Flights in the morning are often more expensive with an average ticket price of $475.

What is the cheapest Montana to Illinois flight route?

Fly from Bozeman Gallatin Field to Chicago Midway for the best Montana - Illinois flight prices

How far in advance should I book a flight from Montana 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 $363 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 $294 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 22% 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

$246

Fastest flight time

2h 55m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Montana in the past 72 hours is $246. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $430.
The fastest flight from Montana to Illinois takes 2h 55m
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?

  • 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
American AirlinesPriceFrom $215Free CancellationRating
7.1
11,924 reviews
Search American Airlines flights
United AirlinesPriceFrom $229Free CancellationRating
7.4
10,112 reviews
Search United Airlines flights
DeltaPriceFrom $230Free CancellationRating
7.8
8,503 reviews
Search Delta flights
Alaska AirlinesPriceFrom $350Free CancellationRating
7.9
12,808 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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