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$134+ 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 7/26. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$239
(United Airlines)

One-way from

$134
(Delta)

Popular in

June

Cheapest in

September

Average price

$523

Good one-way deal

$401 or less
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. 24% potential increase in price ($175 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($49 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a one-way 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 April 17, 2025.

This United Airlines deal was found by Cheapflights users on 4/16. 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.
Sat 5/2412:59 pmGTF - ORD
Nonstop3h 11mUnited Airlines
Sat 5/318:45 amORD - GTF
Nonstop3h 44mUnited Airlines
Deal found 4/16$239
This Delta deal was found by Cheapflights users on 4/16. 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.
Sat 5/246:00 amGTF - MDW
1 stop6h 15mDelta
Sat 5/311:55 pmMDW - GTF
1 stop7h 37mDelta
Deal found 4/16$256
This Delta deal was found by Cheapflights users on 4/16. 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.
Sat 5/246:00 amGTF - ORD
1 stop4h 47mDelta
Sat 5/313:45 pmORD - GTF
1 stop5h 47mDelta
Deal found 4/16$256
This Alaska Airlines deal was found by Cheapflights users on 4/17. 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.
Tue 5/136:07 pmGTF - ORD
1 stop10h 58mAlaska Airlines
Tue 5/207:51 pmORD - GTF
1 stop21h 38mAlaska Airlines
Deal found 4/17$397

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 April 17, 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 5/24

12:59 pm-5:10 pm

Nonstop3h 11m

Chicago O'Hare Intl

Sat 5/31

8:45 am-11:29 am

Nonstop3h 44m

$239

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Sat 5/24

6:00 am-1:15 pm

1 stop6h 15m

Chicago Midway

Sat 5/31

1:55 pm-8:32 pm

1 stop7h 37m

$256

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 5/24

6:00 am-11:47 am

1 stop4h 47m

Chicago O'Hare Intl

Sat 5/31

3:45 pm-8:32 pm

1 stop5h 47m

$256

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 5/13

6:07 pm-6:05 am

1 stop10h 58m

Chicago O'Hare Intl

Tue 5/20

7:51 pm-4:29 pm

1 stop21h 38m

$397

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 7/26

6:20 pm-7:22 am

2 stops12h 02m

$134

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Sat 7/26

6:00 am-1:02 pm

1 stop6h 02m

$164

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 7/26

12:59 pm-5:10 pm

Nonstop3h 11m

$294

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

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

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 April 17, 2025.
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 $418 for a flight from Great Falls to Illinois. The cheapest flight overall is $401 while the most popular route, (Great Falls - Chicago O'Hare Intl) is currently priced at $239.

  • 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$205Average$588FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$302Average$447FlexibilityNo cancel feeOn-time69%

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