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$128+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$274
(Delta)

One-way from

$128
(Kiwi.com)

Popular in

August

Cheapest in

December

Average price

$567
Provider with most accurate pricing for Great Falls-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Great Falls-Chicago (CHI) flights.
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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. 27% potential increase in price ($222 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease ($52 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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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 October 30, 2025.

This Delta deal was found by Cheapflights users on 10/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/81:12 pmGTF - ORD
1 stop7h 09mDelta
Thu 12/117:20 amORD - GTF
1 stop6h 11mDelta
Deal found 10/29$274
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/78:53 pmGTF - MDW
1 stop16h 59mMultiple Airlines
Sun 12/2110:50 pmMDW - GTF
2 stops23h 45mMultiple Airlines
Deal found 10/29$293
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:53 pmGTF - MDW
1 stop16h 59mMultiple Airlines
Sun 12/2110:50 pmMDW - GTF
2 stops23h 45mMultiple Airlines
Deal found 10/29$297
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/78:53 pmGTF - ORD
2 stops26h 20mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/29$305
This Delta deal was found by Cheapflights users on 10/30. 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.
Fri 11/141:12 pmGTF - ORD
1 stop7h 13mDelta
Tue 11/187:20 amORD - GTF
1 stop6h 12mDelta
Deal found 10/30$322
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:12 amGTF - ORD
2 stops19h 52mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/29$333
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/16:44 pmGTF - ORD
2 stops35h 59mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/29$335
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/810:25 pmGTF - ORD
2 stops30h 39mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/28$339
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:17 amGTF - ORD
2 stops17h 47mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/28$344
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/78:53 pmGTF - ORD
1 stop22h 24mMultiple Airlines
Sat 12/209:55 pmORD - GTF
1 stop12h 43mMultiple Airlines
Deal found 10/29$350
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:53 pmGTF - ORD
1 stop23h 02mMultiple Airlines
Sat 12/209:55 pmORD - GTF
1 stop12h 43mMultiple Airlines
Deal found 10/29$354
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:53 pmGTF - ORD
2 stops16h 47mMultiple Airlines
Sun 12/2110:49 pmORD - GTF
1 stop23h 46mMultiple Airlines
Deal found 10/29$365

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 October 30, 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

Mon 12/8

1:12 pm-9:21 pm

1 stop7h 09m

Chicago O'Hare Intl

Thu 12/11

7:20 am-12:31 pm

1 stop6h 11m

$274

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 3/9

4:00 pm-11:59 pm

1 stop6h 59m

Chicago O'Hare Intl

Fri 3/13

7:45 am-3:20 pm

1 stop8h 35m

$274

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sun 1/4

7:21 pm-6:29 am

1 stop10h 08m

Chicago O'Hare Intl

Sat 1/10

8:00 am-7:20 pm

1 stop12h 20m

$303

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Sun 12/7

8:53 pm-2:52 pm

1 stop16h 59m

Chicago Midway

Mon 12/22

6:12 am-9:35 pm

2 stops16h 23m

$367

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Thu 12/4

8:53 pm-2:52 pm

1 stop16h 59m

Chicago Midway

Mon 12/22

6:12 am-9:35 pm

2 stops16h 23m

$371

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Fri 11/14

6:10 pm-8:36 am

2 stops13h 26m

Chicago O'Hare Intl

Tue 11/18

1:14 pm-10:30 pm

2 stops10h 16m

$394

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 1/3

7:21 pm-6:29 am

1 stop10h 08m

Chicago O'Hare Intl

Sat 1/10

8:00 am-7:20 pm

1 stop12h 20m

$400

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sun 12/7

7:35 pm-6:21 am

1 stop9h 46m

Chicago O'Hare Intl

Thu 12/25

6:00 am-6:41 pm

1 stop13h 41m

$409

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 12/6

7:35 pm-6:21 am

1 stop9h 46m

Chicago O'Hare Intl

Thu 12/25

6:00 am-6:41 pm

1 stop13h 41m

$409

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sun 12/7

7:35 pm-6:21 am

1 stop9h 46m

Chicago O'Hare Intl

Wed 12/24

6:00 am-6:41 pm

1 stop13h 41m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 32 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 October 30, 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
7,998 reviews

Overall

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Overall

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,998 reviews
Delta
7.9
Good
7,998 reviews

Overall

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 6h 59m. The distance from Great Falls to Illinois is about 1207 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$277Average$591FlexibilityNo cancel feeOn-time69%

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