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

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

How many flights depart from Great Falls to Illinois on average per week?

As of July 2026, there are 4 flights per week flying from Great Falls to Illinois. The most common day of the week flights depart is Tue, with 25% of flights taking off on this day.

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 July 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.

$220 Cheap Flights from Great Falls to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Great Falls to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:25 pm - 9:29 pm

GTF

ORD

6h 04m

1 stop

4:20 pm - 9:12 pm

ORD

GTF

5h 52m

1 stop

$318United Airlines

Fri, Sep 4 - Sun, Sep 6

1:15 pm - 9:52 pm

GTF

ORD

7h 37m

1 stop

8:25 am - 5:41 pm

ORD

GTF

10h 16m

2 stops

$324Delta

Sat, Sep 26 - Sat, Oct 3

2:25 pm - 9:29 pm

GTF

ORD

6h 04m

1 stop

5:55 am - 1:29 pm

ORD

GTF

8h 34m

1 stop

$339United Airlines

Fri, Aug 14 - Fri, Aug 21

2:25 pm - 9:29 pm

GTF

ORD

6h 04m

1 stop

5:55 am - 1:29 pm

ORD

GTF

8h 34m

1 stop

$340United Airlines

Fri, Aug 14 - Fri, Aug 21

2:25 pm - 10:00 pm

GTF

ORD

6h 35m

1 stop

5:55 am - 1:29 pm

ORD

GTF

8h 34m

1 stop

$382United Airlines

Thu, Sep 10 - Sun, Sep 13

5:40 am - 11:59 am

GTF

ORD

5h 19m

1 stop

7:48 am - 12:28 pm

ORD

GTF

5h 40m

1 stop

$383Delta

Sat, Aug 8 - Wed, Aug 12

5:40 am - 11:59 am

GTF

ORD

5h 19m

1 stop

8:28 am - 5:38 pm

ORD

GTF

10h 10m

2 stops

$389Delta

Thu, Aug 20 - Sat, Aug 22

2:25 pm - 9:52 pm

GTF

ORD

6h 27m

1 stop

1:30 pm - 9:12 pm

ORD

GTF

8h 42m

1 stop

$394United Airlines

Tue, Aug 18 - Tue, Aug 25

2:39 pm - 9:13 pm

GTF

ORD

5h 34m

1 stop

2:18 pm - 9:47 pm

ORD

GTF

8h 29m

1 stop

$408United Airlines

Sat, Nov 7 - Tue, Nov 10

5:40 am - 11:59 am

GTF

ORD

5h 19m

1 stop

8:28 am - 5:38 pm

ORD

GTF

10h 10m

2 stops

$409Delta

Sat, Aug 8 - Tue, Aug 11

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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

Sep 4

GTF2:25 pmGreat Falls

6h 04m

1 stop

ORD9:29 pmChicago O'Hare Intl

Sep 6

ORD4:20 pmChicago O'Hare Intl

5h 52m

1 stop

GTF9:12 pmGreat Falls

$318

United Airlines

Aug 14

GTF2:25 pmGreat Falls

6h 04m

1 stop

ORD9:29 pmChicago O'Hare Intl

Aug 21

ORD5:55 amChicago O'Hare Intl

8h 34m

1 stop

GTF1:29 pmGreat Falls

$339

United Airlines

Aug 14

GTF2:25 pmGreat Falls

6h 04m

1 stop

ORD9:29 pmChicago O'Hare Intl

Aug 21

ORD5:55 amChicago O'Hare Intl

8h 34m

1 stop

GTF1:29 pmGreat Falls

$340

Delta flights from Great Falls to Illinois

Our best Delta deals on Great Falls to Illinois flight tickets

Delta

Sep 26

GTF1:15 pmGreat Falls

7h 37m

1 stop

ORD9:52 pmChicago O'Hare Intl

Oct 3

ORD8:25 amChicago O'Hare Intl

10h 16m

2 stops

GTF5:41 pmGreat Falls

$324

Delta

Aug 8

GTF5:40 amGreat Falls

5h 19m

1 stop

ORD11:59 amChicago O'Hare Intl

Aug 12

ORD7:48 amChicago O'Hare Intl

5h 40m

1 stop

GTF12:28 pmGreat Falls

$383

Delta

Aug 20

GTF5:40 amGreat Falls

5h 19m

1 stop

ORD11:59 amChicago O'Hare Intl

Aug 22

ORD8:28 amChicago O'Hare Intl

10h 10m

2 stops

GTF5:38 pmGreat Falls

$389

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 9/4

2:25 pm-9:29 pm

1 stop6h 04m

Chicago O'Hare Intl

Sun 9/6

4:20 pm-9:12 pm

1 stop5h 52m

$318

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 9/26

1:15 pm-9:52 pm

1 stop7h 37m

Chicago O'Hare Intl

Sat 10/3

8:25 am-5:41 pm

2 stops10h 16m

$324

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 8/14

2:25 pm-9:29 pm

1 stop6h 04m

Chicago O'Hare Intl

Fri 8/21

5:55 am-1:29 pm

1 stop8h 34m

$339

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 8/14

2:25 pm-9:29 pm

1 stop6h 04m

Chicago O'Hare Intl

Fri 8/21

5:55 am-1:29 pm

1 stop8h 34m

$340

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 9/10

2:25 pm-10:00 pm

1 stop6h 35m

Chicago O'Hare Intl

Sun 9/13

5:55 am-1:29 pm

1 stop8h 34m

$382

Quickest round-trip

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 8/8

5:40 am-11:59 am

1 stop5h 19m

Chicago O'Hare Intl

Wed 8/12

7:48 am-12:28 pm

1 stop5h 40m

$383

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 8/20

5:40 am-11:59 am

1 stop5h 19m

Chicago O'Hare Intl

Sat 8/22

8:28 am-5:38 pm

2 stops10h 10m

$389

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 8/18

2:25 pm-9:52 pm

1 stop6h 27m

Chicago O'Hare Intl

Tue 8/25

1:30 pm-9:12 pm

1 stop8h 42m

$394

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 11/7

2:39 pm-9:13 pm

1 stop5h 34m

Chicago O'Hare Intl

Tue 11/10

2:18 pm-9:47 pm

1 stop8h 29m

$408

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 8/8

5:40 am-11:59 am

1 stop5h 19m

Chicago O'Hare Intl

Tue 8/11

8:28 am-5:38 pm

2 stops10h 10m

$409

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

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Great Falls is in November. 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 November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $0.

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 $587. 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 36% 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	$368
Fastest flight time	3h 18m
Direct flights	Wed and Sun
Airports in Illinois	98 airports

The best one-way flight to Illinois from Great Falls in the past 72 hours is $368. The best round-trip flight deal from Great Falls to Illinois found on momondo in the last 72 hours is $568.

The fastest flight from Great Falls to Illinois takes 3h 18m

Direct flights go from Great Falls to Illinois on Wednesday and Sunday. There are no airlines offering direct flights.

There are 98 airports in Illinois. From Great Falls there are direct flights to Chicago O'Hare Intl (ORD).

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 July 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
Delta	PriceFrom $129	Free Cancellation	Rating 7.8 8,458 reviews		Search Delta flights
United Airlines	PriceFrom $300	Free Cancellation	Rating 7.4 9,979 reviews		Search United Airlines 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.