How long does it take to fly to Great Falls?

Flight times from Illinois to Great Falls vary, but if you’re flying out of Chicago and flying into Great Falls (one of the most popular routes), then the duration is 7h 43m on average. Another popular route from Illinois to Great Falls is flying from Peoria to Great Falls, which will take roughly 11h 40m. Keep in mind that layovers or delays could extend your travel time.

What is the cheapest airline that flies from Illinois to Great Falls?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Illinois to Great Falls

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?

The number of operators available for flights from Illinois to Great Falls Airport is 2 as of September 2026.

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.

$259 Cheap Flights from Illinois to Great Falls in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Great Falls

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:45 am - 12:35 pmORD Chicago O'Hare Intl-GTF Great Falls

5h 50m1 stop Salt Lake City

1:18 pm - 10:05 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 47m1 stop Salt Lake City

$328Delta

Fri, Oct 2 - Sat, Oct 10

7:05 am - 5:41 pmORD Chicago O'Hare Intl-GTF Great Falls

11h 36m2 stops Detroit Metropolitan Wayne County Salt Lake City

1:18 pm - 10:05 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 47m1 stop Salt Lake City

$334Delta

Fri, Oct 2 - Sat, Oct 10

7:35 am - 12:38 pmORD Chicago O'Hare Intl-GTF Great Falls

6h 03m1 stop Salt Lake City

1:18 pm - 10:05 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 47m1 stop Salt Lake City

$378Delta

Sat, Oct 24 - Sat, Oct 31

7:35 am - 12:38 pmORD Chicago O'Hare Intl-GTF Great Falls

6h 03m1 stop Salt Lake City

1:18 pm - 11:57 pmGTF Great Falls-ORD Chicago O'Hare Intl

9h 39m2 stops Salt Lake City Atlanta Hartsfield-Jackson

$384Delta

Sat, Oct 24 - Sat, Oct 31

2:30 pm - 9:22 pmORD Chicago O'Hare Intl-GTF Great Falls

7h 52m1 stop Denver Intl

2:37 pm - 9:18 pmGTF Great Falls-ORD Chicago O'Hare Intl

5h 41m1 stop Denver Intl

$398United Airlines

Thu, Sep 24 - Mon, Sep 28

7:00 am - 4:19 pmORD Chicago O'Hare Intl-GTF Great Falls

10h 19m1 stop Seattle/Tacoma Intl

4:59 pm - 11:59 pmGTF Great Falls-ORD Chicago O'Hare Intl

30h 00m1 stop Seattle/Tacoma Intl

$405Alaska Airlines

Sat, Nov 7 - Wed, Nov 11

4:39 pm - 9:38 pmSTL Lambert-St Louis-GTF Great Falls

5h 59m1 stop Denver Intl

2:47 pm - 8:59 pmGTF Great Falls-STL Lambert-St Louis

5h 12m1 stop Denver Intl

$417United Airlines

Sat, Nov 21 - Fri, Dec 4

8:40 am - 1:49 pmORD Chicago O'Hare Intl-GTF Great Falls

6h 09m1 stop Denver Intl

2:45 pm - 11:59 pmGTF Great Falls-ORD Chicago O'Hare Intl

8h 14m1 stop Denver Intl

$418United Airlines

Sat, Nov 7 - Wed, Nov 11

7:36 pm - 4:39 pmSTL Lambert-St Louis-GTF Great Falls

22h 03m1 stop Seattle/Tacoma Intl

5:19 pm - 2:21 pmGTF Great Falls-STL Lambert-St Louis

20h 02m1 stop Seattle/Tacoma Intl

$613Alaska Airlines

Fri, Sep 25 - Tue, Sep 29

3:20 pm - 4:35 pmSTL Lambert-St Louis-GTF Great Falls

26h 15m2 stops Dallas/Fort Worth Seattle/Tacoma Intl

5:15 pm - 9:20 amGTF Great Falls-STL Lambert-St Louis

15h 05m2 stops Seattle/Tacoma Intl Dallas/Fort Worth

$985Alaska Airlines

Mon, Oct 12 - Mon, Oct 19

Cheap last minute flights

Enter your travel dates to find the best prices.

8:00 am - 12:35 pmSTL Lambert-St Louis-GTF Great Falls

5h 35m1 stop Salt Lake City

6:21 pm - 12:44 amGTF Great Falls-STL Lambert-St Louis

5h 23m1 stop Salt Lake City

$468Delta

Fri, Sep 18 - Tue, Sep 22

8:00 am - 12:35 pmSTL Lambert-St Louis-GTF Great Falls

5h 35m1 stop Salt Lake City

5:40 am - 4:47 pmGTF Great Falls-STL Lambert-St Louis

10h 07m2 stops Salt Lake City Minneapolis St Paul

$474Delta

Fri, Sep 18 - Tue, Sep 22

8:00 am - 12:35 pmSTL Lambert-St Louis-GTF Great Falls

5h 35m1 stop Salt Lake City

6:21 pm - 12:44 amGTF Great Falls-STL Lambert-St Louis

5h 23m1 stop Salt Lake City

$488Delta

Fri, Sep 18 - Tue, Sep 22

8:00 am - 12:35 pmSTL Lambert-St Louis-GTF Great Falls

5h 35m1 stop Salt Lake City

5:40 am - 4:47 pmGTF Great Falls-STL Lambert-St Louis

10h 07m2 stops Salt Lake City Minneapolis St Paul

$534Delta

Fri, Sep 18 - Tue, Sep 22

8:00 am - 12:35 pmSTL Lambert-St Louis-GTF Great Falls

5h 35m1 stop Salt Lake City

5:40 am - 4:47 pmGTF Great Falls-STL Lambert-St Louis

10h 07m2 stops Salt Lake City Minneapolis St Paul

$554Delta

Fri, Sep 18 - Tue, Sep 22

5:55 am - 1:29 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 34m1 stop Denver Intl

2:25 pm - 10:46 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 21m1 stop Denver Intl

$573United Airlines

Sun, Sep 13 - Mon, Sep 21

5:55 am - 1:29 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 34m1 stop Denver Intl

2:25 pm - 10:46 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 21m1 stop Denver Intl

$588United Airlines

Sun, Sep 13 - Mon, Sep 21

5:55 am - 1:29 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 34m1 stop Denver Intl

2:25 pm - 10:46 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 21m1 stop Denver Intl

$608United Airlines

Sun, Sep 13 - Mon, Sep 21

12:59 pm - 9:12 pmSTL Lambert-St Louis-GTF Great Falls

9h 13m2 stops Chicago O'Hare Intl Denver Intl

2:25 pm - 8:38 pmGTF Great Falls-STL Lambert-St Louis

5h 13m1 stop Denver Intl

$624United Airlines

Fri, Sep 18 - Tue, Sep 22

6:29 am - 4:39 pmSTL Lambert-St Louis-GTF Great Falls

11h 10m1 stop Seattle/Tacoma Intl

5:19 pm - 2:21 pmGTF Great Falls-STL Lambert-St Louis

20h 02m1 stop Seattle/Tacoma Intl

$748Alaska Airlines

Mon, Sep 14 - Tue, Sep 29

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Alaska Airlines flights from Illinois to Great Falls

Our best Alaska Airlines deals on Illinois to Great Falls flight tickets

Alaska Airlines

Nov 7

ORD7:00 amChicago O'Hare Intl

10h 19m

1 stop

GTF4:19 pmGreat Falls

Nov 11

GTF4:59 pmGreat Falls

30h 00m

1 stop

ORD11:59 pmChicago O'Hare Intl

$405

Alaska Airlines

Nov 1

ORD7:00 amChicago O'Hare Intl

10h 19m

1 stop

GTF4:19 pmGreat Falls

Nov 7

GTF4:59 pmGreat Falls

11h 41m

1 stop

ORD5:40 amChicago O'Hare Intl

$468

Alaska Airlines

Oct 6

ORD9:00 amChicago O'Hare Intl

8h 35m

1 stop

GTF4:35 pmGreat Falls

Oct 12

GTF5:15 pmGreat Falls

11h 25m

1 stop

ORD5:40 amChicago O'Hare Intl

$491

United Airlines flights from Illinois to Great Falls

Our best United Airlines deals on Illinois to Great Falls flight tickets

United Airlines

Sep 24

ORD2:30 pmChicago O'Hare Intl

7h 52m

1 stop

GTF9:22 pmGreat Falls

Sep 28

GTF2:37 pmGreat Falls

5h 41m

1 stop

ORD9:18 pmChicago O'Hare Intl

$398

United Airlines

Nov 21

STL4:39 pmLambert-St Louis

5h 59m

1 stop

GTF9:38 pmGreat Falls

Dec 4

GTF2:47 pmGreat Falls

5h 12m

1 stop

STL8:59 pmLambert-St Louis

$417

United Airlines

Feb 6

STL9:13 amLambert-St Louis

5h 16m

1 stop

GTF1:29 pmGreat Falls

Feb 9

GTF6:15 amGreat Falls

5h 28m

1 stop

STL12:43 pmLambert-St Louis

$418

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Fri 10/2

7:45 am-12:35 pm

1 stop5h 50m

Great Falls

Sat 10/10

1:18 pm-10:05 pm

1 stop7h 47m

$328

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Fri 10/2

7:05 am-5:41 pm

2 stops11h 36m

Great Falls

Sat 10/10

1:18 pm-10:05 pm

1 stop7h 47m

$334

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Sat 10/24

7:35 am-12:38 pm

1 stop6h 03m

Great Falls

Sat 10/31

1:18 pm-10:05 pm

1 stop7h 47m

$378

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Sat 10/24

7:35 am-12:38 pm

1 stop6h 03m

Great Falls

Sat 10/31

1:18 pm-11:57 pm

2 stops9h 39m

$384

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Thu 9/24

2:30 pm-9:22 pm

1 stop7h 52m

Great Falls

Mon 9/28

2:37 pm-9:18 pm

1 stop5h 41m

$398

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Sat 11/7

7:00 am-4:19 pm

1 stop10h 19m

Great Falls

Wed 11/11

4:59 pm-11:59 pm

1 stop30h 00m

$405

Quickest round-trip

St. LouisGreat Falls

STL Lambert-St Louis - GTF Great Falls

STLGTF

Lambert-St Louis

Sat 11/21

4:39 pm-9:38 pm

1 stop5h 59m

Great Falls

Fri 12/4

2:47 pm-8:59 pm

1 stop5h 12m

$417

ChicagoGreat Falls

ORD Chicago O'Hare Intl - GTF Great Falls

ORDGTF

Chicago O'Hare Intl

Sat 11/7

8:40 am-1:49 pm

1 stop6h 09m

Great Falls

Wed 11/11

2:45 pm-11:59 pm

1 stop8h 14m

$418

St. LouisGreat Falls

STL Lambert-St Louis - GTF Great Falls

STLGTF

Lambert-St Louis

Fri 9/25

7:36 pm-4:39 pm

1 stop22h 03m

Great Falls

Tue 9/29

5:19 pm-2:21 pm

1 stop20h 02m

$613

St. LouisGreat Falls

STL Lambert-St Louis - GTF Great Falls

STLGTF

Lambert-St Louis

Mon 10/12

3:20 pm-4:35 pm

2 stops26h 15m

Great Falls

Mon 10/19

5:15 pm-9:20 am

2 stops15h 05m

$985

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the cheapest month to fly to Great Falls?

The month of May is another great option to travel to Great Falls, with average flight prices from Illinois averaging around $296.

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 is only 1 cabin class 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 61% 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

Best Price Found	$259
Fastest flight time	5h 35m
Direct flights	None

The best one-way flight to Great Falls from Illinois in the past 72 hours is $259. The best round-trip flight deal from Illinois to Great Falls found on momondo in the last 72 hours is $328.

The fastest flight from Illinois to Great Falls takes 5h 35m

There are no direct flights from Illinois to Great Falls. There are no popular flight routes from Illinois to Great Falls.

Search flight deals

Frequently asked questions about flying from Illinois to Great Falls

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?
The number of operators available for flights from Illinois to Great Falls Airport is 2 as of September 2026.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Illinois to Great Falls is Embraer 175 (Enhanced Winglets) (100.00% of total bookings).

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
Delta	PriceFrom $318	Free Cancellation	Rating 7.8 8,567 reviews		Search Delta flights

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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.