$332 Find Cheap Flights from Great Falls to Illinois

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Great Falls to Illinois departing on 1/15. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
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, Jan 15 - Sun, Jan 18
Multiple Airlines Logo
10:45 am - 10:43 am
GTF
-
ORD
22h 58m1 stop
Multiple Airlines Logo
10:41 pm - 4:28 pm
ORD
-
GTF
18h 47m1 stop
$332Multiple Airlines
Sat, Feb 14 - Wed, Feb 18
Alaska Airlines Logo
6:28 pm - 2:05 pm
GTF
-
ORD
18h 37m1 stop
Alaska Airlines Logo
7:00 am - 5:48 pm
ORD
-
GTF
11h 48m1 stop
$352Alaska Airlines
Thu, Jan 15 - Sun, Jan 18
Multiple Airlines Logo
10:45 am - 9:24 pm
GTF
-
ORD
33h 39m2 stops
Multiple Airlines Logo
10:41 pm - 4:28 pm
ORD
-
GTF
18h 47m1 stop
$369Multiple Airlines
Sat, Feb 14 - Wed, Feb 18
Alaska Airlines Logo
6:28 pm - 1:11 pm
GTF
-
ORD
17h 43m2 stops
Alaska Airlines Logo
7:00 am - 5:48 pm
ORD
-
GTF
11h 48m1 stop
$407Alaska Airlines
Sat, Feb 14 - Wed, Feb 18
Alaska Airlines Logo
6:28 pm - 1:11 pm
GTF
-
ORD
17h 43m2 stops
Alaska Airlines Logo
7:00 am - 5:48 pm
ORD
-
GTF
11h 48m1 stop
$417Alaska Airlines
Mon, Dec 29 - Fri, Jan 2
United Airlines Logo
6:15 am - 1:19 pm
GTF
-
ORD
6h 04m1 stop
United Airlines Logo
5:50 pm - 10:46 pm
ORD
-
GTF
5h 56m1 stop
$484United Airlines
Thu, Jan 15 - Sun, Jan 18
Alaska Airlines Logo
5:59 pm - 1:10 pm
GTF
-
ORD
18h 11m2 stops
Alaska Airlines Logo
2:06 pm - 5:19 pm
ORD
-
GTF
28h 13m2 stops
$524Alaska Airlines
Mon, Dec 29 - Fri, Jan 2
United Airlines Logo
6:15 am - 6:21 am
GTF
-
ORD
23h 06m2 stops
United Airlines Logo
5:50 pm - 10:46 pm
ORD
-
GTF
5h 56m1 stop
$666United Airlines
Tue, Dec 30 - Sat, Jan 3
United Airlines Logo
2:35 pm - 11:00 pm
GTF
-
ORD
7h 25m1 stop
United Airlines Logo
7:10 am - 1:39 pm
ORD
-
GTF
7h 29m1 stop
$748United Airlines
Tue, Dec 30 - Sat, Jan 3
Delta Logo
6:18 pm - 9:05 am
GTF
-
MDW
13h 47m2 stops
Delta Logo
9:29 am - 5:38 pm
MDW
-
GTF
9h 09m2 stops
$1,980Delta
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

Cheapest flight$332
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.

  • 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 8010 reviews
7.9Entertainment
8.5Crew
8.1Boarding
7.3Food
7.9Comfort
Airline reviews

I noticed that the planes seem to be outdated. There was no entertainment per se. Also, the waiting area did not have any working electrical outlets

10.0 ExcellentMargaret, Dec 2025
BOS - PIT
Read more Delta reviews

I noticed that the planes seem to be outdated. There was no entertainment per se. Also, the waiting area did not have any working electrical outlets

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

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.

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

Information on your arrival and departure airports