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 12m on average. Another popular route from Illinois to Great Falls is flying from Peoria to Great Falls, which will take roughly 8h 07m. 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 July 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.

$183 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

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 am - 12:28 pm

STL

GTF

5h 28m

1 stop

5:40 am - 1:38 pm

GTF

STL

6h 58m

1 stop

$318Delta

Wed, Sep 2 - Sat, Sep 5

7:35 am - 12:33 pm

ORD

GTF

5h 58m

1 stop

1:13 pm - 10:00 pm

GTF

ORD

7h 47m

1 stop

$318Delta

Sat, Oct 24 - Sat, Oct 31

10:53 am - 9:12 pm

STL

GTF

11h 19m

2 stops

2:25 pm - 8:46 pm

GTF

STL

5h 21m

1 stop

$324United Airlines

Wed, Sep 2 - Sun, Sep 6

8:28 am - 5:38 pm

ORD

GTF

10h 10m

2 stops

1:08 pm - 9:33 pm

GTF

ORD

7h 25m

1 stop

$324Delta

Fri, Aug 21 - Sat, Aug 29

8:00 am - 9:12 pm

STL

GTF

14h 12m

2 stops

6:15 am - 3:38 pm

GTF

STL

8h 23m

2 stops

$329United Airlines

Wed, Sep 2 - Sun, Sep 6

6:00 am - 12:28 pm

ORD

GTF

7h 28m

2 stops

1:08 pm - 11:57 pm

GTF

ORD

9h 49m

2 stops

$329Delta

Fri, Aug 21 - Sat, Aug 29

7:29 am - 9:29 am

ORD

GTF

27h 00m

1 stop

10:19 am - 5:37 am

GTF

ORD

18h 18m

1 stop

$332Multiple Airlines

Thu, Aug 6 - Mon, Aug 17

7:29 am - 8:28 pm

ORD

GTF

37h 59m

2 stops

10:19 am - 5:37 am

GTF

ORD

18h 18m

1 stop

$338Multiple Airlines

Sat, Aug 8 - Mon, Aug 17

5:55 am - 1:29 pm

ORD

GTF

8h 34m

1 stop

2:25 pm - 9:29 pm

GTF

ORD

6h 04m

1 stop

$342United Airlines

Fri, Aug 21 - Fri, Aug 28

4:45 pm - 10:38 pm

ORD

GTF

6h 53m

1 stop

5:40 am - 11:59 am

GTF

ORD

5h 19m

1 stop

$348Delta

Sat, Aug 8 - Tue, Aug 18

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

Delta flights from Illinois to Great Falls

Our best Delta deals on Illinois to Great Falls flight tickets

Delta

Sep 2

STL8:00 amLambert-St Louis

5h 28m

1 stop

GTF12:28 pmGreat Falls

Sep 5

GTF5:40 amGreat Falls

6h 58m

1 stop

STL1:38 pmLambert-St Louis

$318

Delta

Aug 21

ORD6:00 amChicago O'Hare Intl

7h 28m

2 stops

GTF12:28 pmGreat Falls

Aug 25

GTF1:08 pmGreat Falls

7h 25m

1 stop

ORD9:33 pmChicago O'Hare Intl

$324

Delta

Aug 21

ORD11:22 amChicago O'Hare Intl

12h 16m

2 stops

GTF10:38 pmGreat Falls

Aug 28

GTF1:08 pmGreat Falls

9h 49m

2 stops

ORD11:57 pmChicago O'Hare Intl

$329

United Airlines flights from Illinois to Great Falls

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

United Airlines

Sep 2

STL8:00 amLambert-St Louis

14h 12m

2 stops

GTF9:12 pmGreat Falls

Sep 5

GTF2:25 pmGreat Falls

5h 21m

1 stop

STL8:46 pmLambert-St Louis

$324

United Airlines

Sep 2

STL8:00 amLambert-St Louis

14h 12m

2 stops

GTF9:12 pmGreat Falls

Sep 6

GTF6:15 amGreat Falls

8h 23m

2 stops

STL3:38 pmLambert-St Louis

$329

United Airlines

Aug 21

ORD5:55 amChicago O'Hare Intl

8h 34m

1 stop

GTF1:29 pmGreat Falls

Aug 28

GTF2:25 pmGreat Falls

6h 04m

1 stop

ORD9:29 pmChicago O'Hare Intl

$342

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 9/2

8:00 am-12:28 pm

1 stop5h 28m

Great Falls

Sat 9/5

5:40 am-1:38 pm

1 stop6h 58m

$318

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 10/24

7:35 am-12:33 pm

1 stop5h 58m

Great Falls

Sat 10/31

1:13 pm-10:00 pm

1 stop7h 47m

$318

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 9/2

10:53 am-9:12 pm

2 stops11h 19m

Great Falls

Sun 9/6

2:25 pm-8:46 pm

1 stop5h 21m

$324

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 8/21

8:28 am-5:38 pm

2 stops10h 10m

Great Falls

Sat 8/29

1:08 pm-9:33 pm

1 stop7h 25m

$324

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 9/2

8:00 am-9:12 pm

2 stops14h 12m

Great Falls

Sun 9/6

6:15 am-3:38 pm

2 stops8h 23m

$329

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 8/21

6:00 am-12:28 pm

2 stops7h 28m

Great Falls

Sat 8/29

1:08 pm-11:57 pm

2 stops9h 49m

$329

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Thu 8/6

7:29 am-9:29 am

1 stop27h 00m

Great Falls

Mon 8/17

10:19 am-5:37 am

1 stop18h 18m

$332

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 8/8

7:29 am-8:28 pm

2 stops37h 59m

Great Falls

Mon 8/17

10:19 am-5:37 am

1 stop18h 18m

$338

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 8/21

5:55 am-1:29 pm

1 stop8h 34m

Great Falls

Fri 8/28

2:25 pm-9:29 pm

1 stop6h 04m

$342

Quickest round-trip

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 8/8

4:45 pm-10:38 pm

1 stop6h 53m

Great Falls

Tue 8/18

5:40 am-11:59 am

1 stop5h 19m

$348

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 April is another great option to travel to Great Falls, with average flight prices from Illinois averaging around $226.

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

Fastest flight time	3h 46m
Direct flights	Wed, 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 Wednesday, 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 July 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 $275	Free Cancellation	Rating 7.4 9,926 reviews		Search United Airlines flights
Delta	PriceFrom $318	Free Cancellation	Rating 7.8 8,452 reviews		Search Delta 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.