$158 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 12/7. 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

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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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Cheap Flights from Great Falls to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$241
Chicago
Chicago1 stop$241

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, Sep 19 - Mon, Sep 22
 Logo
10:21 pm - 11:51 amGTF-ORD
12h 30m1 stop
 Logo
8:15 am - 4:05 pmORD-GTF
8h 50m1 stop
Fri, Sep 19 - Mon, Sep 22
 Logo
10:21 pm - 10:34 amGTF-ORD
11h 13m2 stops
 Logo
6:00 am - 4:05 pmORD-GTF
11h 05m1 stop
Fri, Sep 19 - Mon, Sep 22
 Logo
10:21 pm - 10:11 pmGTF-ORD
22h 50m3 stops
 Logo
6:00 am - 4:05 pmORD-GTF
11h 05m1 stop
Fri, Oct 10 - Sun, Oct 12
United Airlines Logo
2:31 pm - 11:59 pmGTF-ORD
8h 28m1 stop
United Airlines Logo
7:10 am - 1:26 pmORD-GTF
7h 16m1 stop
$326United Airlines
Find Deal
Fri, Oct 10 - Sun, Oct 12
 Logo
10:27 pm - 11:49 amGTF-ORD
12h 22m1 stop
 Logo
12:31 pm - 9:32 pmORD-GTF
34h 01m3 stops
Wed, Aug 13 - Sun, Aug 17
United Airlines Logo
2:35 pm - 9:10 pmGTF-ORD
5h 35m1 stop
United Airlines Logo
7:10 am - 1:36 pmORD-GTF
7h 26m1 stop
$611United Airlines
Find Deal
Thu, Aug 14 - Mon, Aug 18
Delta Logo
11:43 am - 6:07 pmGTF-ORD
5h 24m1 stop
Delta Logo
9:10 am - 5:26 pmORD-GTF
9h 16m2 stops
$744Delta
Find Deal
Thu, Aug 14 - Mon, Aug 18
Alaska Airlines Logo
4:55 pm - 11:39 pmGTF-ORD
29h 44m2 stops
Alaska Airlines Logo
7:00 am - 4:13 pmORD-GTF
34h 13m2 stops
$886Alaska Airlines
Find Deal
Fri, Sep 19 - Mon, Sep 22
Delta Logo
5:40 am - 5:35 pmGTF-MDW
10h 55m2 stops
Delta Logo
9:20 am - 5:27 pmMDW-GTF
9h 07m2 stops
$1,019Delta
Find Deal
Wed, Aug 13 - Sun, Aug 17
Alaska Airlines Logo
4:55 pm - 11:39 pmGTF-ORD
29h 44m2 stops
Alaska Airlines Logo
7:00 am - 4:13 pmORD-GTF
34h 13m2 stops
$1,035Alaska 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?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Great Falls to Illinois.

The cheapest ticket to Illinois from Great Falls found in the last 72 hours was to Chicago, at $721 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 $721.

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 September, when tickets cost $307 (return) on average. On the other hand, the most expensive months are November and August, when the average cost of round-trip tickets is $913 and $643 respectively.

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 seasonMay
Cheapest flight$158
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 13% increase in price.
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 $661.

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.
8.0
Alaska AirlinesOverall score based on 10000 reviews
7.1Food
8.5Crew
8.1Boarding
7.1Entertainment
7.8Comfort
Airline reviews

Flight attendant was rude when I advised her that the bathroom had no paper towels or tissue paper.

8.0 ExcellentRick, Jul 2025AUS - SAN
Read more Alaska Airlines reviews

Flight attendant was rude when I advised her that the bathroom had no paper towels or tissue paper.

Crew was very friendly. Our bags showed up at the carousel within 20 minutes of arrival.

Flight was delayed and hour due to tire issue. First flight of the day, this issue should have been discovered prior to boarding.

Both legs of the trip were delayed about an hour. Planes were new, liked the WiFi availability and entertainment available. Crew was very good. People were happy and helpful. Liked the pilots - they provided updates throughout the flights. Snacks were underwhelming. Drinks were good! Like the smaller sodas and they actually came through the cabin 2x which was great. In Seattle airport the construction caused much confusion for Alaska. Process of printing own tags, etc was chaotic for people who didn’t check in online prior to arrival which in turn caused issues for those who did. Plus airport gates were too small for the number of people flying.

Plane was delayed getting boarded and then again delayed in take-off order. Alaska Airlines must have very little clout at JFK so they don't get priority treatment. All the delays meant we missed the last flight from Portland to Eugene. Alaska did give us hotel voucher for the night...but sent us to a downtown Portland hotel rather than to a nearby airport motel which made for a longer ride at night and then again in the morning. Just made an already long, late night even longer. Hotel was an old outdated Hilton in a slightly seedy part of town. Alaska gave us Lyft vouchers for getting to the hotel, but the return voucher for getting back to the airport in the morning didn't work.

Departing flight to San Diego was delayed. Return flight from SD to SBP was delayed. Not terrible but not ideal

We did have to wait an hour for the runway to be cleared but other than that it was fine.

My experience was great with Alaska Airlines. They were very helpful when I was checking in. The flight crew was very helpful with our needs.

Crew members were friendly, but I wouldn’t use “entertaining” to describe them. Exact step by step instructions on getting wi-fi on the phone would be helpful.

Ease of reservations, confirmation. Cramped seating, very, very uncomfortable! Claustrophobic.

Delayed and took off even later than the scheduled delay time

For a 69 year old with health problems I had the worse experience, no wheelchair when I entered a lady told me to sit and wait while a gentleman told me I had to walk to the Delta station, which I did. I had a carry on and a bag, and I was traveling with my service dog, which was on his carrier and the lady charged me for my carry on luggage, beside all the waiting cause of the delay, I had to walk to get my luggage cause no wheelchair showed up, I am so disappointed. I will get in touch with the company. I got home at 3:00 am, not good for my health situation.

Great experience on Delta. Staff from baggage check to flight attendants were very courteous and professional. My only issue was a personal preference for pretzels instead of the chips and cookies that were offered.

There was no problems, just a little uncomfortable with seats that do not lay back a little

Always good but we must do something about people in rows ahead of you that don't put their seats back up when they are suppose to. And It's rough to not be able to even lean over to get something out of my purse.

Flight was delayed, 30+ bags had to be gate checked. Crew were very friendly!

Everything was good until we were boarding our connection flight in Atlanta, we were told to gate check our carry-on, but when we got inside the plane, there was plenty of room in the overhead.

Did not know my son and I had different seating arrangements. He was fine, but it was disappointing.

Flight was canceled, and no effort was made to help with rebooking, no hotel vouchers, no car transportation and minimal food voucher and most places for food were closed by the time the voucher was given. Waited for 3 hours for bags. Simply the worst travel experience I have ever had

Food was surprisingly good but the WiFi was not great

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

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