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Cheap flights from Great Falls to Illinois from $153

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to Illinois departing on 10/30. 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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Find the cheapest flights from Great Falls to Illinois

Cheap round-trip flights

Delta Logo
1:10 pm - 9:55 pmGTF-ORD
7h 45m1 stop
Delta Logo
7:30 am - 5:44 pmORD-GTF
11h 14m2 stops
$280Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
Delta Logo
1:10 pm - 9:55 pmGTF-ORD
7h 45m1 stop
Delta Logo
7:30 am - 10:53 pmORD-GTF
16h 23m2 stops
$290Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
Hawaiian Airlines Logo
4:00 pm - 5:04 amGTF-ORD
12h 04m1 stop
Hawaiian Airlines Logo
7:45 am - 3:20 pmORD-GTF
8h 35m1 stop
$304Hawaiian Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
Delta Logo
1:10 pm - 11:44 pmGTF-ORD
9h 34m2 stops
Delta Logo
7:30 am - 5:44 pmORD-GTF
11h 14m2 stops
$305Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
7:00 am - 1:12 pmGTF-ORD
5h 12m1 stop
United Airlines Logo
2:17 pm - 9:11 pmORD-GTF
7h 54m1 stop
$306United Airlines
Find Deal
Thu, Sep 25 - Mon, Sep 29
United Airlines Logo
2:31 pm - 11:59 pmGTF-ORD
8h 28m1 stop
United Airlines Logo
2:53 pm - 9:11 pmORD-GTF
7h 18m1 stop
$316United Airlines
Find Deal
Wed, Oct 1 - Sat, Oct 4
Delta Logo
1:10 pm - 9:55 pmGTF-ORD
7h 45m1 stop
Delta Logo
7:30 am - 5:44 pmORD-GTF
11h 14m2 stops
$319Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
Logo
5:14 pm - 4:56 pmGTF-ORD
22h 42m2 stops
Logo
10:43 pm - 8:32 pmORD-GTF
22h 49m1 stop
$386
Find Deal
Thu, Oct 30 - Sun, Nov 2
Alaska Airlines Logo
6:50 pm - 12:24 amGTF-ORD
28h 34m1 stop
Alaska Airlines Logo
5:00 am - 5:10 pmORD-GTF
13h 10m1 stop
$485Alaska Airlines
Find Deal
Fri, Oct 31 - Sun, Nov 2
Alaska Airlines Logo
6:50 pm - 12:24 amGTF-ORD
28h 34m1 stop
Alaska Airlines Logo
5:00 am - 5:10 pmORD-GTF
13h 10m1 stop
$506Alaska Airlines
Find Deal
Thu, Oct 30 - Sun, Nov 2

United Airlines flights from Great Falls to Illinois

Our best United Airlines deals on Great Falls to Illinois flight tickets
United Airlines
Sep 25
GTF7:00 amGreat Falls
5h 12m
1 stop
ORD1:12 pmChicago O'Hare Intl
Sep 29
ORD2:17 pmChicago O'Hare Intl
7h 54m
1 stop
GTF9:11 pmGreat Falls
$306
Find similar
United Airlines
Oct 1
GTF2:31 pmGreat Falls
8h 28m
1 stop
ORD11:59 pmChicago O'Hare Intl
Oct 4
ORD2:53 pmChicago O'Hare Intl
7h 18m
1 stop
GTF9:11 pmGreat Falls
$316
Find similar
United Airlines
Sep 23
GTF2:35 pmGreat Falls
5h 57m
1 stop
ORD9:32 pmChicago O'Hare Intl
Sep 26
ORD2:53 pmChicago O'Hare Intl
7h 18m
1 stop
GTF9:11 pmGreat Falls
$379
Find similar

Alaska Airlines flights from Great Falls to Illinois

Our best Alaska Airlines deals on Great Falls to Illinois flight tickets
Alaska Airlines
Oct 31
GTF6:50 pmGreat Falls
28h 34m
1 stop
ORD12:24 amChicago O'Hare Intl
Nov 2
ORD5:00 amChicago O'Hare Intl
13h 10m
1 stop
GTF5:10 pmGreat Falls
$485
Find similar
Alaska Airlines
Oct 30
GTF6:50 pmGreat Falls
28h 34m
1 stop
ORD12:24 amChicago O'Hare Intl
Nov 2
ORD5:00 amChicago O'Hare Intl
13h 10m
1 stop
GTF5:10 pmGreat Falls
$506
Find similar
Alaska Airlines
Oct 31
GTF6:50 pmGreat Falls
17h 19m
2 stops
ORD1:09 pmChicago O'Hare Intl
Nov 2
ORD5:00 amChicago O'Hare Intl
13h 10m
1 stop
GTF5:10 pmGreat Falls
$532
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 September 11, 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

Tue 3/3

1:10 pm-9:55 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 3/4

7:30 am-5:44 pm

2 stops11h 14m

$280

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 3/3

1:10 pm-9:55 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 3/4

7:30 am-10:53 pm

2 stops16h 23m

$290

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 3/3

4:00 pm-5:04 am

1 stop12h 04m

Chicago O'Hare Intl

Wed 3/4

7:45 am-3:20 pm

1 stop8h 35m

$304

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 3/3

1:10 pm-11:44 pm

2 stops9h 34m

Chicago O'Hare Intl

Wed 3/4

7:30 am-5:44 pm

2 stops11h 14m

$305

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 9/25

7:00 am-1:12 pm

1 stop5h 12m

Chicago O'Hare Intl

Mon 9/29

2:17 pm-9:11 pm

1 stop7h 54m

$306

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Wed 10/1

2:31 pm-11:59 pm

1 stop8h 28m

Chicago O'Hare Intl

Sat 10/4

2:53 pm-9:11 pm

1 stop7h 18m

$316

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 3/3

1:10 pm-9:55 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 3/4

7:30 am-5:44 pm

2 stops11h 14m

$319

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 10/30

5:14 pm-4:56 pm

2 stops22h 42m

Chicago O'Hare Intl

Sun 11/2

10:43 pm-8:32 pm

1 stop22h 49m

$386

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 10/31

6:50 pm-12:24 am

1 stop28h 34m

Chicago O'Hare Intl

Sun 11/2

5:00 am-5:10 pm

1 stop13h 10m

$485

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 10/30

6:50 pm-12:24 am

1 stop28h 34m

Chicago O'Hare Intl

Sun 11/2

5:00 am-5:10 pm

1 stop13h 10m

$506

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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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 month to fly to Illinois?

The cheapest month to fly to Illinois from Great Falls is in September. Flight prices, which tend to average around $307, 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 September, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $324.

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 72% 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
Alaska AirlinesPriceFrom $430Free CancellationRating
8.0
10,000 reviews
Search Alaska 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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