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Cheap flights from Illinois to Great Falls from $137

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 Great Falls departing on 12/8. 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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Find the cheapest flights from Illinois to Great Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
8:00 am - 6:10 pmORD-GTF
11h 10m1 stop
Alaska Airlines Logo
7:35 pm - 6:21 amGTF-ORD
9h 46m1 stop
$275Alaska Airlines
Find Deal
Tue, Nov 18 - Sat, Dec 6
Delta Logo
8:50 am - 5:30 pmORD-GTF
9h 40m2 stops
Delta Logo
6:10 pm - 8:42 amGTF-ORD
13h 32m2 stops
$287Delta
Find Deal
Tue, Nov 18 - Sat, Dec 6
Delta Logo
7:20 am - 12:32 pmORD-GTF
6h 12m1 stop
Delta Logo
6:10 pm - 8:42 amGTF-ORD
13h 32m2 stops
$317Delta
Find Deal
Tue, Nov 18 - Sat, Dec 6
Multiple Airlines Logo
10:49 pm - 9:35 pmORD-GTF
23h 46m1 stop
Multiple Airlines Logo
10:25 pm - 2:17 pmGTF-ORD
14h 52m1 stop
$371Multiple Airlines
Find Deal
Sun, Dec 21 - Mon, Dec 29
Alaska Airlines Logo
6:00 am - 6:55 pmORD-GTF
13h 55m1 stop
Alaska Airlines Logo
8:00 pm - 11:55 pmGTF-ORD
26h 55m1 stop
$380Alaska Airlines
Find Deal
Sun, Dec 14 - Sat, Jan 10
Multiple Airlines Logo
11:45 am - 9:35 pmORD-GTF
34h 50m2 stops
Multiple Airlines Logo
10:25 pm - 2:17 pmGTF-ORD
14h 52m1 stop
$393Multiple Airlines
Find Deal
Thu, Dec 18 - Mon, Dec 29
Delta Logo
1:15 pm - 10:30 pmMDW-GTF
10h 15m2 stops
Delta Logo
1:12 pm - 11:47 pmGTF-MDW
9h 35m2 stops
$393Delta
Find Deal
Tue, Nov 18 - Sat, Dec 6
Hawaiian Airlines Logo
7:00 am - 3:20 pmORD-GTF
9h 20m1 stop
Hawaiian Airlines Logo
4:00 pm - 11:58 pmGTF-ORD
6h 58m1 stop
$411Hawaiian Airlines
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Fri, Apr 17 - Mon, Apr 20
United Airlines Logo
9:00 am - 1:27 pmSTL-GTF
5h 27m1 stop
United Airlines Logo
2:30 pm - 9:54 pmGTF-STL
6h 24m1 stop
$538United Airlines
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Tue, Nov 11 - Sat, Nov 15
United Airlines Logo
8:25 am - 10:39 pmSTL-GTF
15h 14m2 stops
United Airlines Logo
2:30 pm - 9:54 pmGTF-STL
6h 24m1 stop
$544United Airlines
Find Deal
Tue, Nov 11 - Sat, Nov 15

Delta flights from Illinois to Great Falls

Our best Delta deals on Illinois to Great Falls flight tickets
Delta
Nov 18
ORD8:50 amChicago O'Hare Intl
9h 40m
2 stops
GTF5:30 pmGreat Falls
Dec 6
GTF6:10 pmGreat Falls
13h 32m
2 stops
ORD8:42 amChicago O'Hare Intl
$287
Find similar
Delta
Nov 18
ORD7:20 amChicago O'Hare Intl
6h 12m
1 stop
GTF12:32 pmGreat Falls
Dec 6
GTF6:10 pmGreat Falls
13h 32m
2 stops
ORD8:42 amChicago O'Hare Intl
$317
Find similar
Delta
Nov 8
ORD5:15 pmChicago O'Hare Intl
6h 51m
1 stop
GTF11:06 pmGreat Falls
Nov 11
GTF6:10 pmGreat Falls
13h 31m
2 stops
ORD8:41 amChicago O'Hare Intl
$389
Find similar

Alaska Airlines flights from Illinois to Great Falls

Our best Alaska Airlines deals on Illinois to Great Falls flight tickets
Alaska Airlines
Nov 18
ORD8:00 amChicago O'Hare Intl
11h 10m
1 stop
GTF6:10 pmGreat Falls
Dec 6
GTF7:35 pmGreat Falls
9h 46m
1 stop
ORD6:21 amChicago O'Hare Intl
$275
Find similar
Alaska Airlines
Dec 14
ORD6:00 amChicago O'Hare Intl
13h 55m
1 stop
GTF6:55 pmGreat Falls
Jan 10
GTF8:00 pmGreat Falls
26h 55m
1 stop
ORD11:55 pmChicago O'Hare Intl
$380
Find similar
Alaska Airlines
Apr 17
ORD7:00 amChicago O'Hare Intl
9h 20m
1 stop
GTF3:20 pmGreat Falls
Apr 20
GTF4:00 pmGreat Falls
6h 58m
1 stop
ORD11:58 pmChicago O'Hare Intl
$415
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Great Falls 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 October 28, 2025.
Use the filters below to find and compare flights from Illinois to Great Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 11/18

8:00 am-6:10 pm

1 stop11h 10m

Great Falls

Sat 12/6

7:35 pm-6:21 am

1 stop9h 46m

$275

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 11/18

8:50 am-5:30 pm

2 stops9h 40m

Great Falls

Sat 12/6

6:10 pm-8:42 am

2 stops13h 32m

$287

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 11/18

7:20 am-12:32 pm

1 stop6h 12m

Great Falls

Sat 12/6

6:10 pm-8:42 am

2 stops13h 32m

$317

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sun 12/21

10:49 pm-9:35 pm

1 stop23h 46m

Great Falls

Mon 12/29

10:25 pm-2:17 pm

1 stop14h 52m

$371

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sun 12/14

6:00 am-6:55 pm

1 stop13h 55m

Great Falls

Sat 1/10

8:00 pm-11:55 pm

1 stop26h 55m

$380

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Thu 12/18

11:45 am-9:35 pm

2 stops34h 50m

Great Falls

Mon 12/29

10:25 pm-2:17 pm

1 stop14h 52m

$393

ChicagoGreat Falls

MDW - GTF

MDWGTF

Chicago Midway

Tue 11/18

1:15 pm-10:30 pm

2 stops10h 15m

Great Falls

Sat 12/6

1:12 pm-11:47 pm

2 stops9h 35m

$393

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 4/17

7:00 am-3:20 pm

1 stop9h 20m

Great Falls

Mon 4/20

4:00 pm-11:58 pm

1 stop6h 58m

$411

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Tue 11/11

9:00 am-1:27 pm

1 stop5h 27m

Great Falls

Sat 11/15

2:30 pm-9:54 pm

1 stop6h 24m

$538

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Tue 11/11

8:25 am-10:39 pm

2 stops15h 14m

Great Falls

Sat 11/15

2:30 pm-9:54 pm

1 stop6h 24m

$544

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 Great Falls from

How to get the cheapest flight ticket from Illinois to Great Falls

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 day to depart on your flight to Great Falls?

The cheapest day to depart on your flight to Great Falls is on a Friday when prices can be found for as low as $397. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $676.

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

According to our data, the cheapest time of day to fly to Great Falls is in the afternoon. momondo users have found flights departing from Illinois to Great Falls in the afternoon for as low as $398. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $658 on average. Flights to Great Falls from Illinois in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Illinois to Great Falls flight route?

Fly from Chicago O'Hare Intl to Great Falls for the best Illinois - Great Falls flight prices

What cabin class options are available on Illinois to Great Falls flights?

There are 2 cabin classes available to choose from on Illinois to Great Falls 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 Great Falls flights?

You could potentially save up to 41% on your flight if you consider stops on a Illinois to Great Falls flight.

Cheap Illinois to Great Falls flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Great Falls

Direct flights

None
There are no direct flights from Illinois to Great Falls. There are no popular flight routes from Illinois to Great Falls.
Search flight deals

  • When did momondo last update prices for flights from Illinois to Great Falls Airport?

    Prices for flights from Illinois to Great Falls Airport are updated daily.

  • How many operators does momondo search for flights from Illinois to Great Falls Airport?

  • How old do you have to be to fly from Illinois to Great Falls Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Great Falls Airport.

  • What documentation or ID do you need to fly to Great Falls Airport?

    The required travel and health documents for your Great Falls Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Great Falls Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Illinois to Great Falls?

Best airlines flying from Illinois to Great Falls

Compare and see reviews for airlines that fly from Illinois to Great Falls with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights

Traveling to a place near Great Falls?

Book flights to Great Falls if you plan to visit one of these locations
Shelby

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Great Falls?

It is quick and easy to find Illinois to Great Falls flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Great Falls that suits you.

Can I find flights from Illinois to Great Falls with flexible booking policies on momondo?

Flights from Illinois to Great Falls 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 Illinois to Great Falls?

momondo helps you find the best flight between Illinois and Great Falls 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 Great Falls right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Great Falls, momondo offers a useful price alert feature which will track prices for flights to Great Falls from Illinois and alert you when they change.

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