$170 Find Cheap Flights from Great Falls to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Great Falls to Illinois departing on 11/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Book Cheap Great Falls to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Great Falls to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Great Falls to Illinois

Fri, Oct 30 - Wed, Nov 4
Delta Logo
1:13 pm - 10:00 pm
GTF
-
ORD
7h 47m
1 stop
Delta Logo
7:35 am - 12:33 pm
ORD
-
GTF
5h 58m
1 stop
$328Delta
Fri, Oct 30 - Wed, Nov 4
Delta Logo
1:13 pm - 10:00 pm
GTF
-
ORD
7h 47m
1 stop
Delta Logo
8:05 am - 5:42 pm
ORD
-
GTF
10h 37m
2 stops
$334Delta
Thu, Aug 20 - Sun, Aug 23
United Airlines Logo
2:25 pm - 10:00 pm
GTF
-
ORD
6h 35m
1 stop
United Airlines Logo
5:55 am - 1:29 pm
ORD
-
GTF
8h 34m
1 stop
$350United Airlines
Fri, Sep 4 - Mon, Sep 7
Delta Logo
1:08 pm - 9:33 pm
GTF
-
ORD
7h 25m
1 stop
Delta Logo
6:00 am - 12:28 pm
ORD
-
GTF
7h 28m
2 stops
$474Delta
Fri, Oct 30 - Wed, Nov 4
Delta Logo
1:13 pm - 11:51 pm
GTF
-
ORD
9h 38m
2 stops
Delta Logo
7:10 am - 5:42 pm
ORD
-
GTF
11h 32m
2 stops
$479Delta
Thu, Aug 20 - Sun, Aug 23
Delta Logo
5:40 am - 11:59 am
GTF
-
ORD
5h 19m
1 stop
Delta Logo
6:00 am - 12:28 pm
ORD
-
GTF
7h 28m
2 stops
$509Delta
Fri, Oct 30 - Wed, Nov 4
Alaska Airlines Logo
5:15 pm - 8:07 pm
GTF
-
ORD
25h 52m
2 stops
Alaska Airlines Logo
2:25 pm - 4:17 pm
ORD
-
GTF
26h 52m
2 stops
$547Alaska Airlines
Thu, Aug 20 - Sun, Aug 23
Alaska Airlines Logo
5:18 pm - 1:22 pm
GTF
-
ORD
19h 04m
2 stops
Alaska Airlines Logo
8:17 pm - 4:38 pm
ORD
-
GTF
21h 21m
2 stops
$575Alaska Airlines
Thu, Oct 15 - Fri, Oct 23
Alaska Airlines Logo
5:15 pm - 8:07 pm
GTF
-
ORD
25h 52m
2 stops
Alaska Airlines Logo
11:15 am - 4:35 pm
ORD
-
GTF
30h 20m
2 stops
$589Alaska Airlines
Thu, Aug 6 - Mon, Aug 10
Alaska Airlines Logo
5:09 pm - 6:20 am
GTF
-
ORD
12h 11m
1 stop
Alaska Airlines Logo
8:20 pm - 4:29 pm
ORD
-
GTF
21h 09m
1 stop
$648Alaska Airlines
Booking Insights

KAYAK's insights & trends for Great Falls to Illinois flights

Get data-powered insights and trends into flights from Great Falls to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Great Falls to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Great Falls found in the last 5 days was to Chicago, at $478 round-trip. The most popular route is from Great Falls (GTF) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was $478.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Great Falls to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $587 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $587.

Can I save money by flying with a layover from Great Falls to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $452 on average.

What is the cheapest month to fly from Great Falls to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Great Falls to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Great Falls to Illinois is January, when tickets cost $0 (return) on average. On the other hand, the most expensive months are September and July, when the average cost of round-trip tickets is $863 and $693 respectively.

Good to know

Cheapest flight

$170
Flight from Great Falls to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Great Falls to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Great Falls to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Great Falls to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Great Falls to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Great Falls to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Great Falls to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Great Falls to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Great Falls to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many flights are there between Great Falls and Illinois per day?

    There is a maximum of 1 nonstop flight a day that takes off from Great Falls and lands in Illinois, with an average flight time of 3h 18m. The most common departure time is 12:00 pm and most flights take off in the morning. Each week, there are 1 flights.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Great Falls to the following destinations at these prices or less: Chicago $448 one-way - $478 round-trip

Reviews of the top airlines flying from Great Falls to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Great Falls to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Great Falls to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8483 reviews
7.2Food
8.1Boarding
8.5Crew
7.8Entertainment
7.8Comfort
Airline reviews

It was as good as it could be. Flying is not a pleasant experience these days.

8.0 ExcellentMark, Jun 2026
LAX - ORD
Read more Delta reviews

It was as good as it could be. Flying is not a pleasant experience these days.

There was an unruly family behind us that made the short flight miserable!!! The cabin crew did nothing to contain it.

Flight delay was frustrating, also you cannot checkin online without delta app, web browser check-in throw errors

Got on the plane and sat there for an hour before departure.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

Cramped seating for me. Luckily it wasn’t a long flight

5 hour delay. They blamed the weather but it was the computer issues they had been dealing with for days.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

The captain was amazing and kept us informed throughout that there would be some rough air. The flight also got delayed but we were able to actually leave on time, which was great.

The staff did not do a good job of getting everyone boarded quickly, so we missed our take off window and had to sit on the tarmac for 20+ min waiting for our turn. The plan was old. Pockets on the back of seats were torn and tearing off. One of the attendants was rude-she would ask a question but he walking away before you finished answering so she kept getting our drink orders wrong.

Gluten free snack options and meals that offer both gluten free and dairy free.

Not a bad flight but a long delay boarding and taking off due to the pilot not arriving on time.

I would have preferred a flight voucher and to hop on a different flight. Delayed over 6 hours.

I almost missed my connection in Chicago due to having to wait on a gate to be open I am assuming. Having to run from E terminal to C terminal and I barely made it there before they closed the door. This may not be the actual airline's fault it's crazy how there is so little time between flight especially when they are placed so far apart in the airport.

The Wi-Fi did not work, so you weren't able to watch entertainment on your own device. They did not have wired headphones so you couldn't watch it on the in-seat entertainment screen either. There was plenty of time to do a drink and snag service but the flight attendants chose not to.

Great experience, boarding was fast and efficient, so much so that we arrived to Chicago very early

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

The seats on this flight weren’t as comfortable as we had expected. Even leaned back these seats left us feeling crappy in our backs. Also we had to use our own tablets for movies, but nothing in the seats in front of us to hold the tablets up.

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

Horrible experience. They delayed our flight 7 hours!! We had to seat at the airport with kids on 4th July all day!

Everything you need to know for your flight from Great Falls to Illinois

Information on your arrival and departure airports