$128 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 12/4. 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

Mon, Dec 8 - Thu, Dec 11
Delta Logo
1:12 pm - 9:21 pmGTF-ORD
7h 09m1 stop
Delta Logo
7:20 am - 12:31 pmORD-GTF
6h 11m1 stop
$274Delta
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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
$280Delta
Find Deal
Fri, Nov 21 - Mon, Dec 1
Multiple Airlines Logo
10:56 am - 5:32 amGTF-ORD
17h 36m1 stop
Multiple Airlines Logo
9:22 pm - 10:22 amORD-GTF
38h 00m2 stops
$288Multiple Airlines
Find Deal
Sun, Dec 7 - Sun, Dec 21
Multiple Airlines Logo
8:53 pm - 2:52 pmGTF-MDW
16h 59m1 stop
Multiple Airlines Logo
10:50 pm - 9:35 pmMDW-GTF
23h 45m2 stops
$293Multiple Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 21
Multiple Airlines Logo
8:53 pm - 2:52 pmGTF-MDW
16h 59m1 stop
Multiple Airlines Logo
10:50 pm - 9:35 pmMDW-GTF
23h 45m2 stops
$297Multiple Airlines
Find Deal
Sun, Dec 7 - Sun, Dec 21
Multiple Airlines Logo
8:53 pm - 12:13 amGTF-ORD
26h 20m2 stops
Multiple Airlines Logo
10:49 pm - 9:35 pmORD-GTF
23h 46m1 stop
$305Multiple Airlines
Find Deal
Mon, Mar 9 - Fri, Mar 13
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
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Wed, Dec 10 - Wed, Dec 24
Alaska Airlines Logo
7:35 pm - 6:21 amGTF-ORD
9h 46m1 stop
Alaska Airlines Logo
6:00 am - 6:41 pmORD-GTF
13h 41m1 stop
$399Alaska Airlines
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Sat, Dec 6 - Wed, Dec 24
Alaska Airlines Logo
7:35 pm - 6:21 amGTF-ORD
9h 46m1 stop
Alaska Airlines Logo
3:33 pm - 6:41 pmORD-GTF
28h 08m1 stop
$409Alaska Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
2:30 pm - 11:59 pmGTF-ORD
8h 29m1 stop
United Airlines Logo
3:55 pm - 10:39 pmORD-GTF
7h 44m1 stop
$438United Airlines
Find Deal
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 72 hours was to Chicago, at $587 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 72 hours was $587.

What’s the cheapest day of the week to fly from Great Falls to Illinois?

The average price of all round-trip flights from Great Falls to Illinois clicked on KAYAK for each day over the last 12 months.

For Great Falls to Illinois, Tuesday is the cheapest day to fly on average and Saturday is the most expensive. Flying from Illinois back to Great Falls, the best deals are generally found on Wednesday, with Saturday being the most expensive.

Good to know

Low seasonDecember
Cheapest flight$128
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from Great Falls to Chicago Midway 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.

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

    The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost $349 on average. Morning departures are around 89% more expensive than evening flights, 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 $660.

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 7992 reviews
8.2Boarding
7.9Comfort
8.5Crew
7.3Food
7.9Entertainment
Airline reviews

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

8.0 ExcellentJulie, Oct 2025LAX - SFO
Read more Delta reviews

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

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

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