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Cheap flights from Montana to Illinois from $122

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 7/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
American Airlines Logo
2:02 pm - 6:00 pm
BIL
-
ORD
2h 58mnonstop
American Airlines Logo
9:40 am - 11:42 am
ORD
-
BIL
3h 02mnonstop
$251American Airlines
Wed, Oct 21 - Sat, Oct 24
Delta Logo
11:51 am - 6:19 pm
BIL
-
ORD
5h 28m
1 stop
Delta Logo
3:48 pm - 8:12 pm
ORD
-
BIL
5h 24m
1 stop
$271Delta
Wed, Aug 5 - Sat, Aug 15
Delta Logo
11:51 am - 6:19 pm
BIL
-
ORD
5h 28m
1 stop
Delta Logo
8:28 am - 5:48 pm
ORD
-
BIL
10h 20m
2 stops
$276Delta
Wed, Aug 5 - Tue, Aug 11
United Airlines Logo
8:00 am - 11:59 am
BZN
-
ORD
2h 59mnonstop
United Airlines Logo
8:15 pm - 10:43 pm
ORD
-
BZN
3h 28mnonstop
$285United Airlines
Thu, Jul 2 - Sun, Jul 5
Southwest Logo
12:55 pm - 4:50 pm
BZN
-
MDW
2h 55mnonstop
Southwest Logo
10:05 am - 12:15 pm
MDW
-
BZN
3h 10mnonstop
$285Southwest
Wed, Sep 23 - Tue, Sep 29
American Airlines Logo
12:39 pm - 5:00 pm
BZN
-
ORD
3h 21mnonstop
American Airlines Logo
1:30 pm - 3:50 pm
ORD
-
BZN
3h 20mnonstop
$286American Airlines
Thu, Jun 4 - Sun, Jun 7
United Airlines Logo
2:37 pm - 10:41 pm
BZN
-
ORD
7h 04m
1 stop
United Airlines Logo
7:55 pm - 10:18 pm
ORD
-
BZN
3h 23mnonstop
$291United Airlines
Wed, Sep 23 - Tue, Sep 29
Southwest Logo
2:30 pm - 11:45 pm
BZN
-
MDW
8h 15m
1 stop
Southwest Logo
10:50 am - 12:55 pm
MDW
-
BZN
3h 05mnonstop
$295Southwest
Thu, Aug 6 - Mon, Aug 10
Alaska Airlines Logo
4:13 pm - 11:59 pm
MSO
-
ORD
6h 46m
1 stop
Alaska Airlines Logo
9:00 am - 3:17 pm
ORD
-
MSO
7h 17m
1 stop
$329Alaska Airlines
Tue, Sep 1 - Sat, Sep 5
Alaska Airlines Logo
1:04 pm - 11:41 pm
MSO
-
ORD
9h 37m
1 stop
Alaska Airlines Logo
9:00 am - 3:17 pm
ORD
-
MSO
7h 17m
1 stop
$339Alaska Airlines
Tue, Sep 1 - Sat, Sep 5

United Airlines flights from Montana to Illinois

Our best United Airlines deals on Montana to Illinois flight tickets
United Airlines
Jul 2
BZN8:00 amBozeman Gallatin Field
2h 59m
ORD11:59 amChicago O'Hare Intl
Jul 5
ORD8:15 pmChicago O'Hare Intl
3h 28m
BZN10:43 pmBozeman Gallatin Field
$285
United Airlines
Sep 23
BZN2:37 pmBozeman Gallatin Field
7h 04m
1 stop
ORD10:41 pmChicago O'Hare Intl
Sep 29
ORD7:55 pmChicago O'Hare Intl
3h 23m
BZN10:18 pmBozeman Gallatin Field
$291
United Airlines
Jun 11
BZN4:25 pmBozeman Gallatin Field
3h 15m
ORD8:40 pmChicago O'Hare Intl
Jun 15
ORD5:00 amChicago O'Hare Intl
5h 37m
1 stop
BZN9:37 amBozeman Gallatin Field
$295

Delta flights from Montana to Illinois

Our best Delta deals on Montana to Illinois flight tickets
Delta
Aug 5
BIL11:51 amBillings Logan Intl
5h 28m
1 stop
ORD6:19 pmChicago O'Hare Intl
Aug 15
ORD3:48 pmChicago O'Hare Intl
5h 24m
1 stop
BIL8:12 pmBillings Logan Intl
$271
Delta
Aug 5
BIL11:51 amBillings Logan Intl
5h 28m
1 stop
ORD6:19 pmChicago O'Hare Intl
Aug 11
ORD8:28 amChicago O'Hare Intl
10h 20m
2 stops
BIL5:48 pmBillings Logan Intl
$276
Delta
Jun 20
BIL5:20 amBillings Logan Intl
5h 40m
1 stop
ORD12:00 pmChicago O'Hare Intl
Jul 8
ORD5:54 pmChicago O'Hare Intl
6h 26m
1 stop
BIL11:20 pmBillings Logan Intl
$281

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 May 10, 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
Quickest round-trip

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 10/21

2:02 pm-6:00 pm

Nonstop2h 58m

Chicago O'Hare Intl

Sat 10/24

9:40 am-11:42 am

Nonstop3h 02m

$251

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 8/5

11:51 am-6:19 pm

1 stop5h 28m

Chicago O'Hare Intl

Sat 8/15

3:48 pm-8:12 pm

1 stop5h 24m

$271

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 8/5

11:51 am-6:19 pm

1 stop5h 28m

Chicago O'Hare Intl

Tue 8/11

8:28 am-5:48 pm

2 stops10h 20m

$276

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 7/2

8:00 am-11:59 am

Nonstop2h 59m

Chicago O'Hare Intl

Sun 7/5

8:15 pm-10:43 pm

Nonstop3h 28m

$285

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Wed 9/23

12:55 pm-4:50 pm

Nonstop2h 55m

Chicago Midway

Tue 9/29

10:05 am-12:15 pm

Nonstop3h 10m

$285

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 6/4

12:39 pm-5:00 pm

Nonstop3h 21m

Chicago O'Hare Intl

Sun 6/7

1:30 pm-3:50 pm

Nonstop3h 20m

$286

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Wed 9/23

2:37 pm-10:41 pm

1 stop7h 04m

Chicago O'Hare Intl

Tue 9/29

7:55 pm-10:18 pm

Nonstop3h 23m

$291

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 8/6

2:30 pm-11:45 pm

1 stop8h 15m

Chicago Midway

Mon 8/10

10:50 am-12:55 pm

Nonstop3h 05m

$295

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Tue 9/1

4:13 pm-11:59 pm

1 stop6h 46m

Chicago O'Hare Intl

Sat 9/5

9:00 am-3:17 pm

1 stop7h 17m

$329

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Tue 9/1

1:04 pm-11:41 pm

1 stop9h 37m

Chicago O'Hare Intl

Sat 9/5

9:00 am-3:17 pm

1 stop7h 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 July. Flight prices, which tend to average around $118, 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 $398. Flights from Montana to Illinois on a Sunday will generally be more expensive and average around $572. 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 $386. Flights in the morning are often more expensive with an average ticket price of $463.

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 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 $341 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.

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

$218

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 $218. The best round-trip flight deal from Montana to Illinois found on momondo in the last 72 hours is $378.
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?

  • 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 $191Free CancellationRating
7.1
11,668 reviews
Search American Airlines flights
DeltaPriceFrom $210Free CancellationRating
7.9
8,454 reviews
Search Delta flights
United AirlinesPriceFrom $229Free CancellationRating
7.4
9,694 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $350Free CancellationRating
7.9
12,349 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.

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Find better results for your trip to Illinois

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