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

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

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

Prices for flights from Great Falls Airport to Illinois refresh daily.

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

As of October 2026, there are 2 operators available to choose from for flights from Great Falls Airport to Illinois.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Great Falls Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The required travel and health documents for your Illinois 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 Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$313 Cheap Flights from Great Falls to Illinois in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Great Falls to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:10 pm - 9:53 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 43m1 stop Salt Lake City

7:30 am - 12:27 pmORD Chicago O'Hare Intl-GTF Great Falls

5h 57m1 stop Salt Lake City

$348Delta

Fri, Mar 5 - Sat, Mar 13

1:10 pm - 9:53 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 43m1 stop Salt Lake City

7:30 am - 12:27 pmORD Chicago O'Hare Intl-GTF Great Falls

5h 57m1 stop Salt Lake City

$348Delta

Mon, Mar 8 - Sat, Mar 13

2:45 pm - 9:30 pmGTF Great Falls-ORD Chicago O'Hare Intl

5h 45m1 stop Denver Intl

4:20 pm - 9:38 pmORD Chicago O'Hare Intl-GTF Great Falls

6h 18m1 stop Denver Intl

$348United Airlines

Fri, Oct 30 - Fri, Nov 6

2:25 pm - 9:13 pmGTF Great Falls-ORD Chicago O'Hare Intl

5h 48m1 stop Denver Intl

6:00 am - 1:29 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 29m1 stop Denver Intl

$348United Airlines

Sat, Mar 6 - Sat, Mar 13

1:21 pm - 9:47 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 26m1 stop Salt Lake City

2:44 pm - 7:40 pmORD Chicago O'Hare Intl-GTF Great Falls

5h 56m1 stop Salt Lake City

$348Delta

Thu, Nov 19 - Thu, Nov 26

2:45 pm - 9:30 pmGTF Great Falls-ORD Chicago O'Hare Intl

5h 45m1 stop Denver Intl

2:30 pm - 9:38 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 08m1 stop Denver Intl

$348United Airlines

Sat, Nov 14 - Wed, Nov 18

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

7h 47m1 stop Salt Lake City

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

6h 03m1 stop Salt Lake City

$348Delta

Sat, Oct 31 - Sat, Nov 7

4:55 pm - 2:12 pmGTF Great Falls-ORD Chicago O'Hare Intl

20h 17m1 stop Seattle/Tacoma Intl

8:00 am - 4:13 pmORD Chicago O'Hare Intl-GTF Great Falls

9h 13m1 stop Seattle/Tacoma Intl

$500Alaska Airlines

Fri, Mar 5 - Fri, Mar 12

9:51 am - 12:59 amGTF Great Falls-ORD Chicago O'Hare Intl

14h 08m1 stop Phoenix-Mesa Gateway

7:40 am - 9:01 amORD Chicago O'Hare Intl-GTF Great Falls

26h 21m2 stops Houston George Bush Intcntl Phoenix Sky Harbor Intl

$506Multiple Airlines

Sun, Oct 18 - Wed, Oct 21

4:55 pm - 5:01 pmGTF Great Falls-ORD Chicago O'Hare Intl

23h 06m1 stop Seattle/Tacoma Intl

8:00 am - 4:13 pmORD Chicago O'Hare Intl-GTF Great Falls

9h 13m1 stop Seattle/Tacoma Intl

$510Alaska Airlines

Wed, Mar 3 - Fri, Mar 12

Cheap last minute flights

Enter your travel dates to find the best prices.

2:37 pm - 8:43 pmGTF Great Falls-MLI Moline Quad-City

5h 06m1 stop Denver Intl

10:49 am - 9:22 pmMLI Moline Quad-City-GTF Great Falls

11h 33m2 stops Chicago O'Hare Intl Denver Intl

$520United Airlines

Sat, Oct 10 - Sat, Oct 17

6:15 am - 3:00 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 45m1 stop Denver Intl

7:00 am - 1:41 pmORD Chicago O'Hare Intl-GTF Great Falls

7h 41m1 stop Denver Intl

$755United Airlines

Thu, Oct 8 - Sun, Oct 11

5:15 pm - 5:40 amGTF Great Falls-ORD Chicago O'Hare Intl

11h 25m1 stop Seattle/Tacoma Intl

7:16 pm - 4:35 pmORD Chicago O'Hare Intl-GTF Great Falls

22h 19m1 stop Seattle/Tacoma Intl

$788Alaska Airlines

Sat, Oct 10 - Mon, Oct 12

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

7h 47m1 stop Salt Lake City

9:59 am - 5:47 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 48m2 stops Minneapolis St Paul Salt Lake City

$789Delta

Sat, Oct 10 - Mon, Oct 12

2:37 pm - 10:46 pmGTF Great Falls-ORD Chicago O'Hare Intl

7h 09m1 stop Denver Intl

4:20 pm - 9:22 pmORD Chicago O'Hare Intl-GTF Great Falls

6h 02m1 stop Denver Intl

$810United Airlines

Sat, Oct 10 - Mon, Oct 12

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

5h 41m1 stop Denver Intl

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

7h 52m1 stop Denver Intl

$816United Airlines

Sat, Oct 10 - Mon, Oct 12

6:27 pm - 8:39 amGTF Great Falls-ORD Chicago O'Hare Intl

13h 12m2 stops Salt Lake City Atlanta Hartsfield-Jackson

9:59 am - 5:47 pmORD Chicago O'Hare Intl-GTF Great Falls

8h 48m2 stops Minneapolis St Paul Salt Lake City

$824Delta

Sat, Oct 10 - Mon, Oct 12

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

5h 41m1 stop Denver Intl

7:00 am - 1:41 pmORD Chicago O'Hare Intl-GTF Great Falls

7h 41m1 stop Denver Intl

$852United Airlines

Sat, Oct 10 - Mon, Oct 12

2:37 pm - 10:38 pmGTF Great Falls-MLI Moline Quad-City

31h 01m2 stops Denver Intl Chicago O'Hare Intl

10:49 am - 9:22 pmMLI Moline Quad-City-GTF Great Falls

11h 33m2 stops Chicago O'Hare Intl Denver Intl

$862United Airlines

Sat, Oct 10 - Sat, Oct 17

5:15 pm - 5:40 amGTF Great Falls-ORD Chicago O'Hare Intl

11h 25m1 stop Seattle/Tacoma Intl

7:16 pm - 4:35 pmORD Chicago O'Hare Intl-GTF Great Falls

22h 19m1 stop Seattle/Tacoma Intl

$1,254Alaska Airlines

Sat, Oct 10 - Mon, Oct 12

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United Airlines flights from Great Falls to Illinois

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

United Airlines

Nov 6

GTF2:45 pmGreat Falls

7h 01m

1 stop

ORD10:46 pmChicago O'Hare Intl

Nov 8

ORD7:00 amChicago O'Hare Intl

7h 49m

1 stop

GTF1:49 pmGreat Falls

$410

United Airlines

Oct 17

GTF2:37 pmGreat Falls

5h 41m

1 stop

ORD9:18 pmChicago O'Hare Intl

Oct 21

ORD3:50 pmChicago O'Hare Intl

6h 32m

1 stop

GTF9:22 pmGreat Falls

$418

United Airlines

Oct 16

GTF2:37 pmGreat Falls

6h 15m

1 stop

ORD9:52 pmChicago O'Hare Intl

Oct 20

ORD7:00 amChicago O'Hare Intl

7h 41m

1 stop

GTF1:41 pmGreat Falls

$453

Delta flights from Great Falls to Illinois

Our best Delta deals on Great Falls to Illinois flight tickets

Delta

Mar 6

GTF1:10 pmGreat Falls

7h 43m

1 stop

ORD9:53 pmChicago O'Hare Intl

Mar 10

ORD7:30 amChicago O'Hare Intl

5h 57m

1 stop

GTF12:27 pmGreat Falls

$348

Delta

Mar 3

GTF1:10 pmGreat Falls

7h 43m

1 stop

ORD9:53 pmChicago O'Hare Intl

Mar 10

ORD9:30 amChicago O'Hare Intl

14h 23m

2 stops

GTF10:53 pmGreat Falls

$354

Delta

Oct 31

GTF1:18 pmGreat Falls

9h 39m

2 stops

ORD11:57 pmChicago O'Hare Intl

Nov 7

ORD6:30 amChicago O'Hare Intl

12h 17m

2 stops

GTF5:47 pmGreat Falls

$359

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Fri 3/5

1:10 pm-9:53 pm

1 stop7h 43m

Chicago O'Hare Intl

Sat 3/13

7:30 am-12:27 pm

1 stop5h 57m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Mon 3/8

1:10 pm-9:53 pm

1 stop7h 43m

Chicago O'Hare Intl

Sat 3/13

7:30 am-12:27 pm

1 stop5h 57m

$348

Quickest round-trip

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Fri 10/30

2:45 pm-9:30 pm

1 stop5h 45m

Chicago O'Hare Intl

Fri 11/6

4:20 pm-9:38 pm

1 stop6h 18m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Sat 3/6

2:25 pm-9:13 pm

1 stop5h 48m

Chicago O'Hare Intl

Sat 3/13

6:00 am-1:29 pm

1 stop8h 29m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Thu 11/19

1:21 pm-9:47 pm

1 stop7h 26m

Chicago O'Hare Intl

Thu 11/26

2:44 pm-7:40 pm

1 stop5h 56m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Sat 11/14

2:45 pm-9:30 pm

1 stop5h 45m

Chicago O'Hare Intl

Wed 11/18

2:30 pm-9:38 pm

1 stop8h 08m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Sat 10/31

1:18 pm-10:05 pm

1 stop7h 47m

Chicago O'Hare Intl

Sat 11/7

7:35 am-12:38 pm

1 stop6h 03m

$348

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Fri 3/5

4:55 pm-2:12 pm

1 stop20h 17m

Chicago O'Hare Intl

Fri 3/12

8:00 am-4:13 pm

1 stop9h 13m

$500

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Sun 10/18

9:51 am-12:59 am

1 stop14h 08m

Chicago O'Hare Intl

Wed 10/21

7:40 am-9:01 am

2 stops26h 21m

$506

Great FallsChicago

GTF Great Falls - ORD Chicago O'Hare Intl

GTFORD

Great Falls

Wed 3/3

4:55 pm-5:01 pm

1 stop23h 06m

Chicago O'Hare Intl

Fri 3/12

8:00 am-4:13 pm

1 stop9h 13m

$510

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 Great Falls to Illinois

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

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Great Falls is in January. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $328.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Great Falls to Illinois is on a Saturday when prices can be found for as low as $576. Flights from Great Falls to Illinois on a Thursday will generally be more expensive and average around $603. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest Great Falls to Illinois flight route?

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

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

There are 3 cabin classes available to choose from on Great Falls to Illinois 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 Great Falls to Illinois flights?

You could potentially save up to 75% on your flight if you consider stops on a Great Falls to Illinois flight.

Cheap Great Falls to Illinois flight deals and tips

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

Best Price Found	$313
Fastest flight time	5h 45m
Direct flights	None

The best one-way flight to Illinois from Great Falls in the past 72 hours is $313. The best round-trip flight deal from Great Falls to Illinois found on momondo in the last 72 hours is $348.

The fastest flight from Great Falls to Illinois takes 5h 45m

There are no direct flights from Great Falls to Illinois. Popular non-direct route for this connection is Great Falls Airport - Chicago O'Hare Intl Airport.

Search flight deals

Frequently asked questions about flying from Great Falls to Illinois

When did momondo last update prices for flights from Great Falls Airport to Illinois?
Prices for flights from Great Falls Airport to Illinois refresh daily.
How many operators does momondo search for flights from Great Falls Airport to Illinois?
As of October 2026, there are 2 operators available to choose from for flights from Great Falls Airport to Illinois.
How old do you have to be to fly from Great Falls Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Great Falls Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois 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 Illinois. 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 Great Falls to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Great Falls to Illinois is Embraer 175 (Enhanced Winglets) (100.00% of total bookings).

Best airlines flying from Great Falls to Illinois

Compare and see reviews for airlines that fly from Great Falls to Illinois with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $300	Free Cancellation	Rating 7.4 10,282 reviews		Search United Airlines flights
Delta	PriceFrom $323	Free Cancellation	Rating 7.8 8,629 reviews		Search Delta flights

Why use momondo?

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

It is quick and easy to find Great Falls to Illinois 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 Illinois that suits you.

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

Yes. momondo allows you to filter the results for Great Falls to Illinois flights to just show those with flexible booking policies.

How can momondo help me find flights from Great Falls to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Great Falls.

I’m not ready to book a flight from Great Falls to Illinois right now. Can momondo alert me if prices change?

Price alerts on flights to Illinois from Great Falls are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.