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Cheap flights from Great Falls to Illinois from $282

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to Illinois departing on 11/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Multiple Airlines Logo
10:56 am - 12:08 amGTF-ORD
36h 12m2 stops
Multiple Airlines Logo
4:58 pm - 10:22 amORD-GTF
18h 24m1 stop
$282Multiple Airlines
Find Deal
Fri, Nov 21 - Tue, Dec 2
Delta Logo
1:12 pm - 9:21 pmGTF-ORD
7h 09m1 stop
Delta Logo
7:20 am - 12:31 pmORD-GTF
6h 11m1 stop
$298Delta
Find Deal
Mon, Dec 8 - Thu, Dec 11
Delta Logo
6:10 pm - 8:39 amGTF-ORD
13h 29m2 stops
Delta Logo
7:20 am - 12:31 pmORD-GTF
6h 11m1 stop
$304Delta
Find Deal
Mon, Dec 8 - Thu, Dec 11
Hawaiian Airlines Logo
4:00 pm - 11:59 pmGTF-ORD
6h 59m1 stop
Hawaiian Airlines Logo
7:45 am - 3:20 pmORD-GTF
8h 35m1 stop
$311Hawaiian Airlines
Find Deal
Mon, Mar 9 - Fri, Mar 13
Alaska Airlines Logo
7:42 pm - 6:28 amGTF-ORD
9h 46m1 stop
Alaska Airlines Logo
10:00 am - 6:55 pmORD-GTF
9h 55m1 stop
$313Alaska Airlines
Find Deal
Sat, Nov 22 - Wed, Dec 3
Multiple Airlines Logo
10:56 am - 5:32 amGTF-ORD
17h 36m1 stop
Multiple Airlines Logo
4:01 pm - 9:35 pmORD-GTF
54h 34m2 stops
$320Multiple Airlines
Find Deal
Fri, Nov 21 - Wed, Dec 3
Multiple Airlines Logo
10:56 am - 11:06 pmGTF-ORD
35h 10m3 stops
Multiple Airlines Logo
4:58 pm - 10:22 amORD-GTF
18h 24m1 stop
$324Multiple Airlines
Find Deal
Fri, Nov 21 - Tue, Dec 2
Alaska Airlines Logo
4:00 pm - 11:59 pmGTF-ORD
6h 59m1 stop
Alaska Airlines Logo
7:45 am - 3:20 pmORD-GTF
8h 35m1 stop
$388Alaska Airlines
Find Deal
Thu, Mar 12 - Sun, Mar 15
United Airlines Logo
2:30 pm - 11:59 pmGTF-ORD
8h 29m1 stop
United Airlines Logo
8:04 pm - 1:39 pmORD-GTF
18h 35m2 stops
$568United Airlines
Find Deal
Sat, Nov 22 - Tue, Dec 2
United Airlines Logo
6:20 am - 2:48 pmGTF-ORD
7h 28m1 stop
United Airlines Logo
7:10 am - 1:39 pmORD-GTF
7h 29m1 stop
$582United Airlines
Find Deal
Fri, Nov 21 - Wed, Dec 3

Alaska Airlines flights from Great Falls to Illinois

Our best Alaska Airlines deals on Great Falls to Illinois flight tickets
Alaska Airlines
Nov 22
GTF7:42 pmGreat Falls
9h 46m
1 stop
ORD6:28 amChicago O'Hare Intl
Dec 3
ORD10:00 amChicago O'Hare Intl
9h 55m
1 stop
GTF6:55 pmGreat Falls
$313
Find similar
Alaska Airlines
Mar 12
GTF4:00 pmGreat Falls
6h 59m
1 stop
ORD11:59 pmChicago O'Hare Intl
Mar 15
ORD7:45 amChicago O'Hare Intl
8h 35m
1 stop
GTF3:20 pmGreat Falls
$388
Find similar
Alaska Airlines
Nov 22
GTF7:42 pmGreat Falls
9h 46m
1 stop
ORD6:28 amChicago O'Hare Intl
Dec 2
ORD5:51 pmChicago O'Hare Intl
26h 04m
1 stop
GTF6:55 pmGreat Falls
$400
Find similar

United Airlines flights from Great Falls to Illinois

Our best United Airlines deals on Great Falls to Illinois flight tickets
United Airlines
Nov 22
GTF2:30 pmGreat Falls
8h 29m
1 stop
ORD11:59 pmChicago O'Hare Intl
Dec 2
ORD8:04 pmChicago O'Hare Intl
18h 35m
2 stops
GTF1:39 pmGreat Falls
$568
Find similar
United Airlines
Nov 21
GTF6:20 amGreat Falls
7h 28m
1 stop
ORD2:48 pmChicago O'Hare Intl
Dec 3
ORD7:10 amChicago O'Hare Intl
7h 29m
1 stop
GTF1:39 pmGreat Falls
$582
Find similar
United Airlines
Nov 19
GTF2:30 pmGreat Falls
25h 27m
2 stops
ORD4:57 pmChicago O'Hare Intl
Nov 23
ORD9:06 amChicago O'Hare Intl
14h 33m
2 stops
GTF10:39 pmGreat Falls
$617
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Great Falls to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 4, 2025.
Use the filters below to find and compare flights from Great Falls to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 11/21

10:56 am-12:08 am

2 stops36h 12m

Chicago O'Hare Intl

Tue 12/2

4:58 pm-10:22 am

1 stop18h 24m

$282

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 12/8

1:12 pm-9:21 pm

1 stop7h 09m

Chicago O'Hare Intl

Thu 12/11

7:20 am-12:31 pm

1 stop6h 11m

$298

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 12/8

6:10 pm-8:39 am

2 stops13h 29m

Chicago O'Hare Intl

Thu 12/11

7:20 am-12:31 pm

1 stop6h 11m

$304

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 3/9

4:00 pm-11:59 pm

1 stop6h 59m

Chicago O'Hare Intl

Fri 3/13

7:45 am-3:20 pm

1 stop8h 35m

$311

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 11/22

7:42 pm-6:28 am

1 stop9h 46m

Chicago O'Hare Intl

Wed 12/3

10:00 am-6:55 pm

1 stop9h 55m

$313

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 11/21

10:56 am-5:32 am

1 stop17h 36m

Chicago O'Hare Intl

Wed 12/3

4:01 pm-9:35 pm

2 stops54h 34m

$320

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 11/21

10:56 am-11:06 pm

3 stops35h 10m

Chicago O'Hare Intl

Tue 12/2

4:58 pm-10:22 am

1 stop18h 24m

$324

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 3/12

4:00 pm-11:59 pm

1 stop6h 59m

Chicago O'Hare Intl

Sun 3/15

7:45 am-3:20 pm

1 stop8h 35m

$388

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 11/22

2:30 pm-11:59 pm

1 stop8h 29m

Chicago O'Hare Intl

Tue 12/2

8:04 pm-1:39 pm

2 stops18h 35m

$568

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 11/21

6:20 am-2:48 pm

1 stop7h 28m

Chicago O'Hare Intl

Wed 12/3

7:10 am-1:39 pm

1 stop7h 29m

$582

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Illinois from

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

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 Tuesday when prices can be found for as low as $299. Flights from Great Falls to Illinois on a Saturday will generally be more expensive and average around $661. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Great Falls to Illinois during this time can be as low as $349. Flights in the morning are often more expensive with an average ticket price of $660.

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 42% 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

Direct flights

None
There are no direct flights from Great Falls to Illinois. There are no popular flight routes from Great Falls to Illinois.
Search flight deals

  • 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?

  • 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.

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 AirlinesPriceFrom $277Free CancellationRating
7.4
9,002 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.

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