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Great Falls

$143+ Cheap flights from Illinois to Great Falls (GTF)

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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — GTF
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Illinois to Great Falls

Cheapest flights from Illinois to Great Falls
Explore the most affordable flight options available from Illinois to Great Falls. 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.
Wed 12/313:42 pmORD - GTF
1 stop8h 04mUnited Airlines
Mon 1/52:35 pmGTF - ORD
1 stop8h 24mUnited Airlines
Deal found 12/15$433
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:19 pmORD - GTF
2 stops24h 22mAlaska Airlines
Mon 1/57:21 pmGTF - ORD
2 stops32h 41mAlaska Airlines
Deal found 12/15$820
This Delta deal was found by Cheapflights users on 12/16. 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 12/162:02 pmSTL - GTF
2 stops9h 28mDelta
Fri 1/21:11 pmGTF - STL
1 stop7h 23mDelta
Deal found 12/16$938
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/165:27 pmSTL - GTF
3 stops30h 10mUnited Airlines
Fri 1/22:35 pmGTF - STL
1 stop6h 47mUnited Airlines
Deal found 12/16$1,067
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 12/309:29 amMDW - GTF
2 stops9h 09mDelta
Sat 1/36:18 pmGTF - MDW
2 stops13h 47mDelta
Deal found 12/15$1,980

Find flight deals from Illinois to Great Falls

Keep the following information in mind while searching for Illinois to Great Falls flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$303
(Alaska Airlines)

One-way from

$143
(Alaska Airlines)

Popular in

August

Cheapest in

December

Average price

$248
Provider with most accurate pricing for Chicago (CHI)-Great Falls flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Great Falls flights.
Search Deals
From Illinois to Great Falls
Search Deals
One-way flight from Illinois to Great Falls
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Great Falls 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 Illinois to Great Falls that are best for you.

Fly from

Illinois

Fly to

Great Falls

Route

Depart

Return

Price

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Sat 1/17

8:00 am-5:19 pm

1 stop10h 19m

Great Falls

Wed 1/21

5:59 pm-2:38 pm

1 stop19h 39m

$303

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Thu 2/5

6:06 pm-5:19 pm

1 stop24h 13m

Great Falls

Sun 2/8

5:59 pm-1:10 pm

2 stops18h 11m

$318

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 2/10

3:35 pm-5:19 pm

1 stop26h 44m

Great Falls

Sat 2/14

6:28 pm-2:05 pm

1 stop18h 37m

$332

PeoriaGreat Falls

PIA - GTF

PIAGTF

Greater Peoria

Sat 1/17

10:45 am-9:43 pm

2 stops11h 58m

Great Falls

Wed 1/21

2:29 pm-8:47 pm

1 stop5h 18m

$354

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 1/17

6:19 pm-5:19 pm

1 stop24h 00m

Great Falls

Tue 1/27

5:59 pm-1:54 pm

1 stop18h 55m

$362

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 1/31

6:19 pm-5:19 pm

1 stop24h 00m

Great Falls

Wed 2/4

5:59 pm-1:54 pm

1 stop18h 55m

$372

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Sat 1/17

6:19 pm-5:19 pm

1 stop24h 00m

Great Falls

Wed 1/21

5:59 pm-1:54 pm

1 stop18h 55m

$372

PeoriaGreat Falls

PIA - GTF

PIAGTF

Greater Peoria

Sat 1/24

6:30 am-1:48 pm

2 stops8h 18m

Great Falls

Tue 1/27

2:29 pm-8:47 pm

1 stop5h 18m

$399

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Tue 1/20

2:50 pm-5:19 pm

1 stop27h 29m

Great Falls

Sat 1/24

5:59 pm-1:54 pm

1 stop18h 55m

$404

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 1/2

5:50 pm-10:46 pm

1 stop5h 56m

Great Falls

Mon 1/5

2:35 pm-11:00 pm

1 stop7h 25m

$406

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 31 results
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Best time to book a flight from Illinois to Great Falls

Have a flexible travel schedule? Discover the best time to fly to Great Falls from Illinois 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 Illinois to Great Falls

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

Find hourly flight availability from Illinois to Great Falls. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

One of the essential ways to save on airfare from Illinois to Great Falls is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 14% on airfare.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Great Falls. 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 into for flights to Great Falls from Illinois?

    Great Falls (GTF), located 3.5 mi from the city center, is the airport you fly into when you book flights from Illinois to Great Falls.

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

    Alaska Airlines, United Airlines, and Delta can get you from Illinois to Great Falls in just under 6h 52m. Your travel time can differ by up to 5h 06m. The distance between Illinois and Great Falls is about 1212 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Illinois to Great Falls?

    While some choose either Lambert-St Louis - Great Falls or Chicago Midway - Great Falls, Chicago O'Hare Intl - Great Falls is the most popular route from Illinois to Great Falls.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Great Falls 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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Top airline flying from Illinois to Great Falls

Discover the top airline that operate flights from Illinois to Great Falls. 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$248Average$530FlexibilityNo cancel feeOn-time69%

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