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Great Falls

$362+ Cheap flights from Illinois to Great Falls (GTF)

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — GTF
Sep 10 — Sep 171
Wed 9/10
Wed 9/17
1 adult, Economy
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Cheap 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 September 5, 2025.

Round-trip from

$274
(Alaska Airlines)

Popular in

October

Cheapest in

January

Average price

$338
From Illinois to Great Falls
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find 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 September 5, 2025.

This United Airlines deal was found by Cheapflights users on 9/4. 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.
Fri 9/127:15 amORD - GTF
1 stop7h 22mUnited Airlines
Fri 9/192:35 pmGTF - ORD
1 stop7h 07mUnited Airlines
Deal found 9/4$362
This United Airlines deal was found by Cheapflights users on 9/2. 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 9/161:58 pmORD - GTF
1 stop8h 30mUnited Airlines
Fri 9/192:35 pmGTF - ORD
1 stop7h 07mUnited Airlines
Deal found 9/2$382
This Delta deal was found by Cheapflights users on 9/4. 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.
Thu 10/166:50 amSTL - GTF
1 stop6h 38mDelta
Sun 10/196:09 pmGTF - STL
1 stop5h 15mDelta
Deal found 9/4$423
This Alaska Airlines deal was found by Cheapflights users on 9/4. 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.
Fri 9/196:20 amORD - GTF
1 stop10h 29mAlaska Airlines
Tue 9/234:29 pmGTF - ORD
1 stop13h 34mAlaska Airlines
Deal found 9/4$457
This Kiwi.com deal was found by Cheapflights users on 9/4. 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.
Fri 9/126:00 amORD - GTF
2 stops16h 31mMultiple Airlines
Fri 9/1910:21 pmGTF - ORD
1 stop12h 30mMultiple Airlines
Deal found 9/4$461
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Fri 9/198:20 pmORD - GTF
2 stops18h 17mUnited Airlines
Tue 9/232:35 pmGTF - ORD
1 stop7h 07mUnited Airlines
Deal found 9/4$468
This Alaska Airlines deal was found by Cheapflights users on 9/3. 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.
Thu 10/166:33 amSTL - GTF
1 stop12h 02mAlaska Airlines
Sun 10/196:15 pmGTF - STL
2 stops27h 50mAlaska Airlines
Deal found 9/3$503
This Alaska Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 9/186:30 pmSTL - GTF
1 stop22h 19mAlaska Airlines
Mon 9/224:29 pmGTF - STL
1 stop21h 10mAlaska Airlines
Deal found 9/2$538
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/109:00 amSTL - GTF
1 stop5h 37mUnited Airlines
Wed 9/172:35 pmGTF - STL
1 stop5h 11mUnited Airlines
Deal found 9/3$577
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 9/189:00 amSTL - GTF
1 stop5h 37mUnited Airlines
Mon 9/222:35 pmGTF - STL
2 stops24h 09mUnited Airlines
Deal found 9/2$623
This Alaska Airlines deal was found by Cheapflights users on 9/4. 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.
Fri 11/216:00 amORD - GTF
1 stop14h 02mAlaska Airlines
Sat 11/297:42 pmGTF - ORD
2 stops32h 19mAlaska Airlines
Deal found 9/4$731
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Fri 11/217:10 amORD - GTF
1 stop16h 29mUnited Airlines
Sat 11/292:30 pmGTF - ORD
1 stop11h 50mUnited Airlines
Deal found 9/3$782

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 September 5, 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

Fri 9/12

7:15 am-1:37 pm

1 stop7h 22m

Great Falls

Fri 9/19

2:35 pm-10:42 pm

1 stop7h 07m

$362

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Tue 9/16

1:58 pm-9:28 pm

1 stop8h 30m

Great Falls

Fri 9/19

2:35 pm-10:42 pm

1 stop7h 07m

$382

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Thu 10/16

6:50 am-12:28 pm

1 stop6h 38m

Great Falls

Sun 10/19

6:09 pm-12:24 am

1 stop5h 15m

$423

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 9/19

6:20 am-3:49 pm

1 stop10h 29m

Great Falls

Tue 9/23

4:29 pm-7:03 am

1 stop13h 34m

$457

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 9/12

6:00 am-9:31 pm

2 stops16h 31m

Great Falls

Fri 9/19

10:21 pm-11:51 am

1 stop12h 30m

$461

ChicagoGreat Falls

ORD - GTF

ORDGTF

Chicago O'Hare Intl

Fri 9/19

8:20 pm-1:37 pm

2 stops18h 17m

Great Falls

Tue 9/23

2:35 pm-10:42 pm

1 stop7h 07m

$468

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Thu 10/16

6:33 am-5:35 pm

1 stop12h 02m

Great Falls

Sun 10/19

6:15 pm-11:05 pm

2 stops27h 50m

$503

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Thu 9/18

6:30 pm-3:49 pm

1 stop22h 19m

Great Falls

Mon 9/22

4:29 pm-2:39 pm

1 stop21h 10m

$538

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Thu 10/16

5:00 am-9:11 pm

2 stops17h 11m

Great Falls

Sun 10/19

2:31 pm-8:46 pm

1 stop5h 15m

$574

St. LouisGreat Falls

STL - GTF

STLGTF

Lambert-St Louis

Wed 9/10

4:40 pm-9:28 pm

1 stop5h 48m

Great Falls

Wed 9/17

2:35 pm-8:46 pm

1 stop5h 11m

$577

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/4

Showing 1-10 of 16 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 September 5, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Great Falls as you normally would.

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?

    United Airlines, Delta, and Alaska Airlines can get you from Illinois to Great Falls in just under 6h 38m. Your travel time can differ by up to 3h 51m. 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.

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

    Currently, January is the cheapest month in which you can book a flight from Illinois to Great Falls (average of $367). Flying from Illinois to Great Falls in July is currently the most expensive (average of $574). 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

Traveling to a place near Great Falls?

Book flights to Great Falls if you plan to visit one of these locations
Shelby

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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 September 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$248Average$534FlexibilityNo cancel feeOn-time69%

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