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$332+ Cheap flights from Great Falls (GTF) to Illinois

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/15. 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.
Tue 12/302:35 pmGTF - ORD
1 stop7h 25mUnited Airlines
Sat 1/37:10 amORD - GTF
1 stop7h 29mUnited Airlines
Deal found 12/15$748
This Delta deal was found by Cheapflights users on 12/15. 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.
Tue 12/306:18 pmGTF - MDW
2 stops13h 47mDelta
Sat 1/39:29 amMDW - GTF
2 stops9h 09mDelta
Deal found 12/15$1,980
This Delta deal was found by Cheapflights users on 12/15. 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.
Tue 12/305:30 amGTF - ORD
2 stops11h 17mDelta
Sat 1/37:00 amORD - GTF
2 stops11h 38mDelta
Deal found 12/15$1,980

Find 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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$332
(Alaska Airlines)
Provider with most accurate pricing for Great Falls-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Great Falls-Chicago (CHI) flights.
Search Deals
From Great Falls to Illinois
Search Deals

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 December 18, 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

Sat 2/14

6:28 pm-4:33 pm

1 stop21h 05m

Chicago O'Hare Intl

Wed 2/18

7:00 am-5:48 pm

1 stop11h 48m

$332

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 1/2

10:25 pm-9:00 pm

2 stops21h 35m

Chicago O'Hare Intl

Sun 1/4

10:49 pm-9:40 pm

1 stop23h 51m

$605

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 1/1

6:15 am-11:00 pm

1 stop15h 45m

Chicago O'Hare Intl

Mon 1/5

2:31 pm-10:46 pm

1 stop9h 15m

$677

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 12/30

2:35 pm-11:00 pm

1 stop7h 25m

Chicago O'Hare Intl

Sat 1/3

7:10 am-1:39 pm

1 stop7h 29m

$748

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 1/1

7:21 pm-6:29 am

1 stop10h 08m

Chicago O'Hare Intl

Mon 1/5

3:33 pm-6:41 pm

1 stop28h 08m

$751

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Thu 1/1

5:30 am-5:19 pm

2 stops10h 49m

Chicago Midway

Mon 1/5

1:28 pm-10:30 pm

2 stops10h 02m

$1,930

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Tue 12/30

6:18 pm-9:05 am

2 stops13h 47m

Chicago Midway

Sat 1/3

9:29 am-5:38 pm

2 stops9h 09m

$1,980

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 1/3

7:21 pm-12:13 pm

1 stop15h 52m

$503

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 1/3

2:35 pm-11:20 am

2 stops19h 45m

$525

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Sat 1/3

10:38 am-9:58 pm

3 stops58h 20m

$781

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 11 results
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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
No data available for this route at this time. Please check back soon.

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 December 18, 2025.
Read through reviews of airlines operating flights from Great Falls to Illinois, such as 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.
Delta
7.9
Good
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,005 reviews
Delta
7.9
Good
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,092 reviews
Delta
7.9
Good
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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.

  • How long is the flight from Great Falls to Illinois?

    Departing from Great Falls to Illinois will take you 10h 49m. The distance from Great Falls to Illinois is about 1220 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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.

See more FAQs

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Alternative routes for Great Falls to Illinois

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Top airline flying from Great Falls to Illinois

Discover the top airline 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$277Average$591FlexibilityNo cancel feeOn-time69%

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