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$158+ Cheap flights from Great Falls (GTF) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Ağu 5 — Ağu 121
Sal 8/5
Sal 8/12
1 adult, Economy
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Cheap flight deals from Great Falls to Illinois

Keep the following information in mind while searching for Great Falls to Illinois flight deals. Data was last updated Temmuz 31, 2025.

Round-trip from

$241
(Mytrip)

One-way from

$158
(Delta)

Popular in

November

Cheapest in

September

Average price

$532

Good round-trip deal

$721 or less
From Great Falls to Illinois
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One-way flight from Great Falls to Illinois
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Highest demand for flights based on searches. 12% potential increase in price ($71 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Great Falls to Illinois.
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Find flight deals from Great Falls to Illinois

Cheapest flights from Great Falls to Illinois
Explore the most affordable flight options available from Great Falls to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Temmuz 31, 2025.

This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cum 9/1910:21 pmGTF - ORD
1 stop12h 30mMultiple Airlines
Pzt 9/228:15 amORD - GTF
1 stop8h 50mMultiple Airlines
Deal found 7/29$241
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cum 10/102:31 pmGTF - ORD
1 stop8h 28mUnited Airlines
Paz 10/127:10 amORD - GTF
1 stop7h 16mUnited Airlines
Deal found 7/30$326
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Pzt 8/45:45 amGTF - ORD
1 stop5h 08mDelta
Per 8/711:20 amORD - GTF
2 stops12h 25mDelta
Deal found 7/31$720
This Alaska Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Per 8/144:55 pmGTF - ORD
2 stops29h 44mAlaska Airlines
Pzt 8/187:00 amORD - GTF
2 stops34h 13mAlaska Airlines
Deal found 7/30$886
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cum 9/195:40 amGTF - MDW
2 stops10h 55mDelta
Pzt 9/229:20 amMDW - GTF
2 stops9h 07mDelta
Deal found 7/30$1,019

Cheapflights Fare Finder

 
Customize your flight search to find flights from Great Falls to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated Temmuz 31, 2025.
Use the filters below to find and compare flights from Great Falls to Illinois that are best for you.

Fly from

Great Falls

Fly to

Illinois

Route

Depart

Return

Price

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Cum 9/19

10:21 pm-11:51 am

1 stop12h 30m

Chicago O'Hare Intl

Pzt 9/22

6:00 am-4:05 pm

1 stop11h 05m

$241

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Cum 10/10

2:31 pm-11:59 pm

1 stop8h 28m

Chicago O'Hare Intl

Paz 10/12

7:10 am-1:26 pm

1 stop7h 16m

$326

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Per 8/14

11:43 am-6:07 pm

1 stop5h 24m

Chicago O'Hare Intl

Pzt 8/18

9:10 am-5:26 pm

2 stops9h 16m

$744

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Per 8/14

4:55 pm-11:39 pm

2 stops29h 44m

Chicago O'Hare Intl

Pzt 8/18

7:00 am-4:13 pm

2 stops34h 13m

$886

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Cum 9/19

5:40 am-5:35 pm

2 stops10h 55m

Chicago Midway

Pzt 9/22

9:20 am-5:27 pm

2 stops9h 07m

$1,019

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Paz 12/7

5:30 am-12:24 pm

1 stop5h 54m

$158

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Paz 9/14

4:29 pm-7:03 am

1 stop13h 34m

$223

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Paz 12/7

5:30 am-6:07 pm

2 stops11h 37m

$440

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Best time to book a flight from Great Falls to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Great Falls with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest time of day to fly from GTF to IL?

Find hourly flight availability from Great Falls to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated Temmuz 31, 2025.

When flying from Great Falls to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated Temmuz 31, 2025.
Read through reviews of airlines operating flights from Great Falls to Illinois, such as Alaska Airlines, Delta, and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,902 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Great Falls to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Great Falls to Illinois?

    Great Falls (GTF) is the airport you will fly out of if you book a flight from Great Falls to Illinois. It is only a 3.5 mi journey to Great Falls (GTF) from Great Falls’s city center.

  • What are the cheapest flights from Great Falls to Illinois?

    On average you can expect to pay $728 for a flight from Great Falls to Illinois. The cheapest flight overall is $721 while the most popular route, (Great Falls - Chicago Midway) is currently priced at $358.

  • Can I find deals for flights from Great Falls to Illinois that include hotel bookings?

    Yes. In addition to deals on Great Falls to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Great Falls to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Great Falls to Illinois.

  • Can I find deals for business class flights from Great Falls to Illinois?

    Yes. Cheapflights offers flight deals from Great Falls to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Great Falls to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Great Falls to Illinois (average of $245). Flying from Great Falls to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 2 airlines flying from Great Falls to Illinois

Discover the top 2 airlines that operate flights from Great Falls to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated Temmuz 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$226Average$393FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$430Average$588FlexibilityNo cancel feeOn-time75%

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