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

Alaska Airlines, United Airlines, and Delta 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 May 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.

$185 Cheap Flights from Great Falls to Illinois in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

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

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.

1:20 pm - 9:57 pm

GTF

ORD

7h 37m

1 stop

7:45 am - 12:37 pm

ORD

GTF

5h 52m

1 stop

$318Delta

Mon, Jun 29 - Sat, Jul 11

1:08 pm - 9:58 pm

GTF

ORD

7h 50m

1 stop

8:28 am - 5:42 pm

ORD

GTF

10h 14m

2 stops

$324Delta

Thu, Aug 13 - Mon, Aug 17

5:40 am - 12:00 pm

GTF

ORD

5h 20m

1 stop

7:45 am - 12:37 pm

ORD

GTF

5h 52m

1 stop

$343Delta

Tue, Jun 30 - Sat, Jul 11

5:40 am - 12:00 pm

GTF

ORD

5h 20m

1 stop

7:45 am - 12:37 pm

ORD

GTF

5h 52m

1 stop

$348Delta

Wed, Jun 10 - Sat, Jul 11

1:20 pm - 9:57 pm

GTF

ORD

7h 37m

1 stop

3:55 pm - 10:37 pm

ORD

GTF

7h 42m

2 stops

$349Delta

Mon, Jun 29 - Tue, Jul 14

2:37 pm - 10:49 pm

GTF

ORD

7h 12m

1 stop

8:40 am - 11:26 am

ORD

GTF

3h 46mnonstop

$361United Airlines

Sat, Jun 6 - Sat, Jun 13

5:19 pm - 6:20 am

GTF

ORD

12h 01m

1 stop

3:52 pm - 4:39 pm

ORD

GTF

25h 47m

1 stop

$363Alaska Airlines

Fri, Sep 11 - Mon, Sep 14

2:37 pm - 10:49 pm

GTF

ORD

7h 12m

1 stop

8:40 am - 11:26 am

ORD

GTF

3h 46mnonstop

$368United Airlines

Sat, Jun 6 - Sat, Jun 13

5:40 am - 12:00 pm

GTF

ORD

5h 20m

1 stop

3:55 pm - 10:37 pm

ORD

GTF

7h 42m

2 stops

$374Delta

Tue, Jun 30 - Tue, Jul 14

1:20 pm - 9:57 pm

GTF

ORD

7h 37m

1 stop

7:45 am - 12:37 pm

ORD

GTF

5h 52m

1 stop

$383Delta

Mon, Jun 29 - Fri, Jul 10

Delta flights from Great Falls to Illinois

Our best Delta deals on Great Falls to Illinois flight tickets

Delta

Jun 29

GTF1:20 pmGreat Falls

7h 37m

1 stop

ORD9:57 pmChicago O'Hare Intl

Jul 11

ORD7:45 amChicago O'Hare Intl

5h 52m

1 stop

GTF12:37 pmGreat Falls

$318

Delta

Aug 13

GTF1:08 pmGreat Falls

7h 50m

1 stop

ORD9:58 pmChicago O'Hare Intl

Aug 17

ORD8:28 amChicago O'Hare Intl

10h 14m

2 stops

GTF5:42 pmGreat Falls

$324

Delta

Jun 30

GTF5:40 amGreat Falls

5h 20m

1 stop

ORD12:00 pmChicago O'Hare Intl

Jul 11

ORD7:45 amChicago O'Hare Intl

5h 52m

1 stop

GTF12:37 pmGreat Falls

$343

United Airlines flights from Great Falls to Illinois

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

United Airlines

Jun 6

GTF2:37 pmGreat Falls

7h 12m

1 stop

ORD10:49 pmChicago O'Hare Intl

Jun 13

ORD8:40 amChicago O'Hare Intl

3h 46m

GTF11:26 amGreat Falls

$361

United Airlines

Jun 6

GTF2:37 pmGreat Falls

7h 12m

1 stop

ORD10:49 pmChicago O'Hare Intl

Jun 13

ORD8:40 amChicago O'Hare Intl

3h 46m

GTF11:26 amGreat Falls

$368

United Airlines

Jun 13

GTF2:37 pmGreat Falls

7h 12m

1 stop

ORD10:49 pmChicago O'Hare Intl

Jun 20

ORD8:40 amChicago O'Hare Intl

3h 46m

GTF11:26 amGreat Falls

$385

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 6/29

1:20 pm-9:57 pm

1 stop7h 37m

Chicago O'Hare Intl

Sat 7/11

7:45 am-12:37 pm

1 stop5h 52m

$318

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 8/13

1:08 pm-9:58 pm

1 stop7h 50m

Chicago O'Hare Intl

Mon 8/17

8:28 am-5:42 pm

2 stops10h 14m

$324

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 6/30

5:40 am-12:00 pm

1 stop5h 20m

Chicago O'Hare Intl

Sat 7/11

7:45 am-12:37 pm

1 stop5h 52m

$343

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Wed 6/10

5:40 am-12:00 pm

1 stop5h 20m

Chicago O'Hare Intl

Sat 7/11

7:45 am-12:37 pm

1 stop5h 52m

$348

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 6/29

1:20 pm-9:57 pm

1 stop7h 37m

Chicago O'Hare Intl

Tue 7/14

3:55 pm-10:37 pm

2 stops7h 42m

$349

Quickest round-trip

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 6/6

2:37 pm-10:49 pm

1 stop7h 12m

Chicago O'Hare Intl

Sat 6/13

8:40 am-11:26 am

Nonstop3h 46m

$361

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 9/11

5:19 pm-6:20 am

1 stop12h 01m

Chicago O'Hare Intl

Mon 9/14

3:52 pm-4:39 pm

1 stop25h 47m

$363

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 6/6

2:37 pm-10:49 pm

1 stop7h 12m

Chicago O'Hare Intl

Sat 6/13

8:40 am-11:26 am

Nonstop3h 46m

$368

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 6/30

5:40 am-12:00 pm

1 stop5h 20m

Chicago O'Hare Intl

Tue 7/14

3:55 pm-10:37 pm

2 stops7h 42m

$374

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 6/29

1:20 pm-9:57 pm

1 stop7h 37m

Chicago O'Hare Intl

Fri 7/10

7:45 am-12:37 pm

1 stop5h 52m

$383

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 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 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 2 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	$576
Fastest flight time	3h 18m
Direct flights	Wed, Thu, Fri and Sun
Airports in Illinois	98 airports

The best flight deal from Great Falls to Illinois found on momondo in the last 72 hours is $576

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

Direct flights go from Great Falls to Illinois on Wednesday, Thursday, Friday 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 May 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 7.9 8,434 reviews		Search Delta flights
United Airlines	PriceFrom $277	Free Cancellation	Rating 7.4 9,747 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.