$195 Find Cheap Flights from Great Falls to Illinois

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 9/17. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Great Falls to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Great Falls to Illinois, as well as popular online travel agencies
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Flight Deals

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

Thu, Sep 3 - Sun, Sep 6
Delta Logo
1:08 pm - 9:30 pm
GTF
-
ORD
7h 22m
1 stop
Delta Logo
7:48 am - 12:28 pm
ORD
-
GTF
5h 40m
1 stop
$318Delta
Wed, Aug 12 - Fri, Aug 21
Delta Logo
1:08 pm - 9:30 pm
GTF
-
ORD
7h 22m
1 stop
Delta Logo
11:22 am - 10:38 pm
ORD
-
GTF
12h 16m
2 stops
$324Delta
Sat, Aug 15 - Fri, Aug 21
Delta Logo
6:18 pm - 8:44 am
GTF
-
ORD
13h 26m
2 stops
Delta Logo
1:59 pm - 10:38 pm
ORD
-
GTF
9h 39m
2 stops
$329Delta
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
2:25 pm - 10:46 pm
GTF
-
ORD
7h 21m
1 stop
United Airlines Logo
7:00 am - 1:29 pm
ORD
-
GTF
7h 29m
1 stop
$347United Airlines
Wed, Aug 12 - Tue, Aug 18
Delta Logo
1:08 pm - 9:30 pm
GTF
-
ORD
7h 22m
1 stop
Delta Logo
7:48 am - 12:28 pm
ORD
-
GTF
5h 40m
1 stop
$348Delta
Tue, Aug 11 - Fri, Aug 21
Delta Logo
1:08 pm - 9:30 pm
GTF
-
ORD
7h 22m
1 stop
Delta Logo
1:59 pm - 10:38 pm
ORD
-
GTF
9h 39m
2 stops
$354Delta
Thu, Nov 5 - Sun, Nov 8
Delta Logo
5:30 am - 2:57 pm
GTF
-
ORD
8h 27m
2 stops
Delta Logo
1:35 pm - 10:53 pm
ORD
-
GTF
10h 18m
2 stops
$359Delta
Mon, Aug 10 - Sun, Aug 16
Multiple Airlines Logo
10:19 am - 5:37 am
GTF
-
ORD
18h 18m
1 stop
Multiple Airlines Logo
7:15 am - 9:29 am
ORD
-
GTF
27h 14m
1 stop
$374Multiple Airlines
Thu, Sep 17 - Thu, Sep 24
Alaska Airlines Logo
5:19 pm - 6:20 am
GTF
-
ORD
12h 01m
1 stop
Alaska Airlines Logo
8:00 am - 4:39 pm
ORD
-
GTF
9h 39m
1 stop
$378Alaska Airlines
Wed, Aug 12 - Fri, Aug 21
Delta Logo
1:08 pm - 9:30 pm
GTF
-
ORD
7h 22m
1 stop
Delta Logo
7:48 am - 12:28 pm
ORD
-
GTF
5h 40m
1 stop
$383Delta
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.

How much is a round-trip flight from Great Falls to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Great Falls to Illinois departing in September.

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 $556 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 $556.

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 $593 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 $593.

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 $440 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 October and May, when the average cost of round-trip tickets is $591 and $538 respectively.

Good to know

Cheapest flight$195
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.

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.
7.9
DeltaOverall score based on 8396 reviews
8.1Boarding
7.2Food
7.8Comfort
7.8Entertainment
8.5Crew
Airline reviews

Should never have had to go to Detroit from Orlando back to Tennessee!

6.0 GoodCynthia, Jun 2026
DTW - TYS
Read more Delta reviews

Should never have had to go to Detroit from Orlando back to Tennessee!

Got rerouted from a straight flight from Orlando to Atlanta to Knoxville to a flight from Orlando to Detroit to Knoxville! Seriously!! Flight delay out of Detroit! Long day for what should have been a pretty easy travel day!

Two delays on two separate planes with parts they could not easily find and replace.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Only beverages were offered to first class and I thought the flight attendant could have also served the Delta Comfort as well instead of sitting down and staring at her phone and walking past all of us to the back of the plane to charge her phone more. There was a complete lack of turbulence and was safe enough for flights attendant to walk around in the front of the plane, collect trash and serve a few people water and turn off the seat belt light. Also didn’t enforce people putting their seats into the upright position and allowed two passengers to remain reclined during landing. They seemed out to lunch completely. Usually my experience on Delta is much better.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

Flight was great! This flight from Atlanta was even better than when I paid for Comfort from SNA to Atlanta.

Connection flights should be spaced out farther because too close I missed my connection.

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

On time! There were plenty of airport employees who were able to keep us moving in the right direction. The crew on the plane were professional.

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

This flight is a quick way to get to Chicago, but a bit expensive.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

boarded early to only find out that flight would sit at gate for 45 min to an hour. Landed in chicago and sat on runway for over an hour before got to gate. Total delay was extensive for a 45 min flight door to door.

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

The flight I was supposed to be on was supposed to take off at 1:50 from State College. It was delayed over and over and over again until somehow I had to rebook on a flight that was supposed to have left State College at 8 am that morning but didn't end up taking off until almost 6 pm. Not only was this completely unacceptable, the "token from United" was a 15 dollar meal voucher that has to be used by today. I would personally like some miles added to my account for this inconvenience. I was in transit for 8 hours from the time I arrive at State College Aiport to when I got home. I was supposed to be home at 3 pm and I returned at 8 pm. Unacceptable. I have not been on an on Time united flight in nearly 5 years.

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

Information on your arrival and departure airports