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Cheap flights from Illinois to Great Falls from $165

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 5/29. 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 Great Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
2:33 pm - 9:19 pm
ORD
-
GTF
7h 46m
1 stop
United Airlines Logo
2:29 pm - 9:39 pm
GTF
-
ORD
6h 10m
1 stop
$258United Airlines
Fri, May 29 - Tue, Jun 2
Delta Logo
7:20 am - 12:24 pm
ORD
-
GTF
6h 04m
1 stop
Delta Logo
5:30 am - 11:51 am
GTF
-
ORD
5h 21m
1 stop
$262Delta
Fri, Apr 10 - Mon, Apr 13
Alaska Airlines Logo
8:00 am - 4:26 pm
ORD
-
GTF
9h 26m
1 stop
Alaska Airlines Logo
5:06 pm - 6:39 am
GTF
-
ORD
12h 33m
1 stop
$266Alaska Airlines
Fri, Apr 10 - Mon, Apr 13
Delta Logo
2:00 pm - 10:26 pm
ORD
-
GTF
9h 26m
2 stops
Delta Logo
1:07 pm - 9:50 pm
GTF
-
ORD
7h 43m
1 stop
$268Delta
Fri, May 29 - Mon, Jun 1
Delta Logo
6:29 am - 5:42 pm
STL
-
GTF
12h 13m
2 stops
Delta Logo
6:22 pm - 12:21 am
GTF
-
STL
4h 59m
1 stop
$294Delta
Wed, Mar 11 - Wed, Mar 18
Delta Logo
7:45 am - 12:27 pm
ORD
-
GTF
5h 42m
1 stop
Delta Logo
1:07 pm - 9:50 pm
GTF
-
ORD
7h 43m
1 stop
$297Delta
Fri, May 29 - Mon, Jun 1
Delta Logo
7:15 am - 12:24 pm
STL
-
GTF
6h 09m
1 stop
Delta Logo
6:22 pm - 12:21 am
GTF
-
STL
4h 59m
1 stop
$302Delta
Wed, Mar 11 - Wed, Mar 18
Delta Logo
6:12 pm - 10:30 pm
STL
-
GTF
5h 18m
1 stop
Delta Logo
6:22 pm - 12:21 am
GTF
-
STL
4h 59m
1 stop
$313Delta
Mon, Mar 9 - Fri, Mar 13
Alaska Airlines Logo
2:09 pm - 4:26 pm
ORD
-
GTF
27h 17m
2 stops
Alaska Airlines Logo
5:06 pm - 6:39 am
GTF
-
ORD
12h 33m
1 stop
$340Alaska Airlines
Fri, Apr 10 - Mon, Apr 13
Multiple Airlines Logo
9:02 am - 9:30 am
BMI
-
GTF
25h 28m
2 stops
Multiple Airlines Logo
10:02 pm - 8:15 pm
GTF
-
BMI
21h 13m
1 stop
$958Multiple Airlines
Thu, Mar 12 - Thu, Mar 19

Alaska Airlines flights from Illinois to Great Falls

Our best Alaska Airlines deals on Illinois to Great Falls flight tickets
Alaska Airlines
Apr 10
ORD8:00 amChicago O'Hare Intl
9h 26m
1 stop
GTF4:26 pmGreat Falls
Apr 13
GTF5:06 pmGreat Falls
12h 33m
1 stop
ORD6:39 amChicago O'Hare Intl
$266
Alaska Airlines
Apr 10
ORD2:09 pmChicago O'Hare Intl
27h 17m
2 stops
GTF4:26 pmGreat Falls
Apr 13
GTF5:06 pmGreat Falls
12h 33m
1 stop
ORD6:39 amChicago O'Hare Intl
$340
Alaska Airlines
Feb 25
ORD7:00 amChicago O'Hare Intl
11h 48m
1 stop
GTF5:48 pmGreat Falls
Mar 1
GTF4:57 pmGreat Falls
18h 04m
1 stop
ORD12:01 pmChicago O'Hare Intl
$358

Delta flights from Illinois to Great Falls

Our best Delta deals on Illinois to Great Falls flight tickets
Delta
Apr 10
ORD7:20 amChicago O'Hare Intl
6h 04m
1 stop
GTF12:24 pmGreat Falls
Apr 13
GTF5:30 amGreat Falls
5h 21m
1 stop
ORD11:51 amChicago O'Hare Intl
$262
Delta
May 29
ORD2:00 pmChicago O'Hare Intl
9h 26m
2 stops
GTF10:26 pmGreat Falls
Jun 1
GTF1:07 pmGreat Falls
7h 43m
1 stop
ORD9:50 pmChicago O'Hare Intl
$268
Delta
Mar 11
STL6:29 amLambert-St Louis
12h 13m
2 stops
GTF5:42 pmGreat Falls
Mar 18
GTF6:22 pmGreat Falls
4h 59m
1 stop
STL12:21 amLambert-St Louis
$294

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 February 13, 2026.
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

Fri 5/29

2:33 pm-9:19 pm

1 stop7h 46m

Great Falls

Tue 6/2

2:29 pm-9:39 pm

1 stop6h 10m

$258

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 4/10

7:20 am-12:24 pm

1 stop6h 04m

Great Falls

Mon 4/13

5:30 am-11:51 am

1 stop5h 21m

$262

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 4/10

8:00 am-4:26 pm

1 stop9h 26m

Great Falls

Mon 4/13

5:06 pm-6:39 am

1 stop12h 33m

$266

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 5/29

2:00 pm-10:26 pm

2 stops9h 26m

Great Falls

Mon 6/1

1:07 pm-9:50 pm

1 stop7h 43m

$268

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 3/11

6:29 am-5:42 pm

2 stops12h 13m

Great Falls

Wed 3/18

6:22 pm-12:21 am

1 stop4h 59m

$294

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 5/29

7:45 am-12:27 pm

1 stop5h 42m

Great Falls

Mon 6/1

1:07 pm-9:50 pm

1 stop7h 43m

$297

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 3/11

7:15 am-12:24 pm

1 stop6h 09m

Great Falls

Wed 3/18

6:22 pm-12:21 am

1 stop4h 59m

$302

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Mon 3/9

6:12 pm-10:30 pm

1 stop5h 18m

Great Falls

Fri 3/13

6:22 pm-12:21 am

1 stop4h 59m

$313

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 4/10

2:09 pm-4:26 pm

2 stops27h 17m

Great Falls

Mon 4/13

5:06 pm-6:39 am

1 stop12h 33m

$340

BloomingtonGreat Falls

BMI - GTF

BMIGTF

Bloomington-Normal

Thu 3/12

9:02 am-9:30 am

2 stops25h 28m

Great Falls

Thu 3/19

10:02 pm-8:15 pm

1 stop21h 13m

$958

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 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 33% 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

Fastest flight time

3h 43m

Direct flights

Sun

Airports in Great Falls

1 airport
The fastest flight from Illinois to Great Falls takes 3h 43m
Direct flights go from Illinois to Great Falls on Sunday. There are no airlines offering direct flights.
There is 1 airport in Great Falls. From Illinois there are direct flights to Great Falls (GTF).
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
9,289 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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