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 6h 19m on average. Another popular route from Illinois to Great Falls is flying from Peoria to Great Falls, which will take roughly 13h 43m. Keep in mind that layovers or delays could extend your travel time.

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

Delta is the most popular carrier 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 May 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.

$144 Cheap Flights from Illinois to Great Falls in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Illinois to Great Falls

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:05 am - 1:41 pm

ORD

GTF

7h 36m

1 stop

2:37 pm - 10:49 pm

GTF

ORD

7h 12m

1 stop

$318United Airlines

Wed, Jun 3 - Sat, Jun 13

5:00 pm - 10:26 pm

ORD

GTF

6h 26m

1 stop

6:25 pm - 8:05 am

GTF

ORD

12h 40m

2 stops

$324Delta

Sat, Jun 6 - Mon, Jun 15

5:00 pm - 10:43 pm

STL

GTF

6h 43m

1 stop

6:28 pm - 12:41 am

GTF

STL

5h 13m

1 stop

$328Delta

Sat, Aug 8 - Thu, Aug 13

8:42 am - 5:39 pm

ORD

GTF

9h 57m

2 stops

6:25 pm - 8:05 am

GTF

ORD

12h 40m

2 stops

$329Delta

Tue, Jun 2 - Tue, Jun 16

5:00 pm - 10:43 pm

STL

GTF

6h 43m

1 stop

6:28 pm - 8:08 am

GTF

STL

12h 40m

2 stops

$334Delta

Sat, Aug 8 - Thu, Aug 13

5:00 pm - 10:26 pm

ORD

GTF

6h 26m

1 stop

1:20 pm - 9:57 pm

GTF

ORD

7h 37m

1 stop

$343Delta

Sat, Jun 6 - Tue, Jun 16

8:42 am - 5:39 pm

ORD

GTF

9h 57m

2 stops

1:20 pm - 9:57 pm

GTF

ORD

7h 37m

1 stop

$349Delta

Tue, Jun 2 - Tue, Jun 16

8:42 am - 5:39 pm

ORD

GTF

9h 57m

2 stops

6:25 pm - 8:05 am

GTF

ORD

12h 40m

2 stops

$354Delta

Fri, Jun 5 - Mon, Jun 15

7:15 am - 9:34 am

ORD

GTF

27h 19m

1 stop

10:19 am - 5:28 am

GTF

ORD

18h 09m

1 stop

$365Multiple Airlines

Thu, Jul 23 - Mon, Jul 27

4:45 pm - 9:34 pm

STL

GTF

5h 49m

1 stop

2:25 pm - 8:38 pm

GTF

STL

5h 13m

1 stop

$435United Airlines

Sat, Aug 8 - Thu, Aug 13

Alaska Airlines flights from Illinois to Great Falls

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

Alaska Airlines

May 15

STL4:12 pmLambert-St Louis

27h 00m

1 stop

GTF6:12 pmGreat Falls

May 18

GTF6:52 pmGreat Falls

19h 24m

1 stop

STL3:16 pmLambert-St Louis

$488

Alaska Airlines

Jun 9

ORD5:44 pmChicago O'Hare Intl

23h 45m

1 stop

GTF4:29 pmGreat Falls

Jun 16

GTF5:09 pmGreat Falls

12h 11m

1 stop

ORD6:20 amChicago O'Hare Intl

$518

Alaska Airlines

Aug 1

ORD6:00 amChicago O'Hare Intl

11h 29m

1 stop

GTF4:29 pmGreat Falls

Aug 8

GTF5:09 pmGreat Falls

26h 06m

2 stops

ORD8:15 pmChicago O'Hare Intl

$524

United Airlines flights from Illinois to Great Falls

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

United Airlines

Jun 3

ORD7:05 amChicago O'Hare Intl

7h 36m

1 stop

GTF1:41 pmGreat Falls

Jun 13

GTF2:37 pmGreat Falls

7h 12m

1 stop

ORD10:49 pmChicago O'Hare Intl

$318

United Airlines

Jun 20

ORD8:40 amChicago O'Hare Intl

3h 46m

GTF11:26 amGreat Falls

Jun 27

GTF2:37 pmGreat Falls

7h 12m

1 stop

ORD10:49 pmChicago O'Hare Intl

$393

United Airlines

Jun 3

ORD7:05 amChicago O'Hare Intl

7h 36m

1 stop

GTF1:41 pmGreat Falls

Jun 13

GTF12:30 pmGreat Falls

3h 18m

ORD4:48 pmChicago O'Hare Intl

$415

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Wed 6/3

7:05 am-1:41 pm

1 stop7h 36m

Great Falls

Sat 6/13

2:37 pm-10:49 pm

1 stop7h 12m

$318

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 6/6

5:00 pm-10:26 pm

1 stop6h 26m

Great Falls

Mon 6/15

6:25 pm-8:05 am

2 stops12h 40m

$324

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 8/8

5:00 pm-10:43 pm

1 stop6h 43m

Great Falls

Thu 8/13

6:28 pm-12:41 am

1 stop5h 13m

$328

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 6/2

8:42 am-5:39 pm

2 stops9h 57m

Great Falls

Tue 6/16

6:25 pm-8:05 am

2 stops12h 40m

$329

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 8/8

5:00 pm-10:43 pm

1 stop6h 43m

Great Falls

Thu 8/13

6:28 pm-8:08 am

2 stops12h 40m

$334

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 6/6

5:00 pm-10:26 pm

1 stop6h 26m

Great Falls

Tue 6/16

1:20 pm-9:57 pm

1 stop7h 37m

$343

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 6/2

8:42 am-5:39 pm

2 stops9h 57m

Great Falls

Tue 6/16

1:20 pm-9:57 pm

1 stop7h 37m

$349

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 6/5

8:42 am-5:39 pm

2 stops9h 57m

Great Falls

Mon 6/15

6:25 pm-8:05 am

2 stops12h 40m

$354

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Thu 7/23

7:15 am-9:34 am

1 stop27h 19m

Great Falls

Mon 7/27

10:19 am-5:28 am

1 stop18h 09m

$365

Quickest round-trip

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 8/8

4:45 pm-9:34 pm

1 stop5h 49m

Great Falls

Thu 8/13

2:25 pm-8:38 pm

1 stop5h 13m

$435

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 August is another great option to travel to Great Falls, with average flight prices from Illinois averaging around $169.

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

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

Fastest flight time	3h 46m
Direct flights	Thu, Fri and Sun
Airports in Great Falls	1 airport

The fastest flight from Illinois to Great Falls takes 3h 46m

Direct flights go from Illinois to Great Falls on Thursday, Friday and 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

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 May 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
United Airlines	PriceFrom $248	Free Cancellation	Rating 7.4 9,701 reviews		Search United Airlines flights

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.