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$147+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$344
(Hawaiian Airlines)

One-way from

$147
(Delta)

Popular in

June

Cheapest in

September

Average price

$406
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
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($160 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 2/19. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/83:52 pmGTF - ORD
1 stop7h 07mHawaiian Airlines
Fri 4/117:00 amORD - GTF
1 stop9h 12mHawaiian Airlines
Deal found 2/19$344
This Delta deal was found by Cheapflights users on 2/19. 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 4/85:30 amGTF - ORD
1 stop6h 08mDelta
Fri 4/116:15 amORD - GTF
2 stops12h 30mDelta
Deal found 2/19$347
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 5/286:00 amGTF - MDW
1 stop6h 05mDelta
Wed 6/42:00 pmMDW - GTF
1 stop7h 04mDelta
Deal found 2/19$416
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 4/33:52 pmGTF - ORD
1 stop7h 07mAlaska Airlines
Tue 4/87:40 amORD - GTF
1 stop8h 32mAlaska Airlines
Deal found 2/19$441
This United Airlines deal was found by Cheapflights users on 2/19. 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 8/72:15 pmGTF - ORD
1 stop9h 05mUnited Airlines
Thu 8/147:10 amORD - GTF
1 stop7h 19mUnited Airlines
Deal found 2/19$510

Find flights from Great Falls to Illinois within your budget

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 February 20, 2025.

Fly from

Great Falls

Fly to

Illinois

Route

Depart

Return

Price

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 4/8

3:52 pm-11:59 pm

1 stop7h 07m

Chicago O'Hare Intl

Fri 4/11

7:00 am-3:12 pm

1 stop9h 12m

$344

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 4/8

5:30 am-12:38 pm

1 stop6h 08m

Chicago O'Hare Intl

Fri 4/11

6:15 am-5:45 pm

2 stops12h 30m

$347

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Wed 5/28

6:00 am-1:05 pm

1 stop6h 05m

Chicago Midway

Wed 6/4

2:00 pm-8:04 pm

1 stop7h 04m

$416

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 4/3

3:52 pm-11:59 pm

1 stop7h 07m

Chicago O'Hare Intl

Tue 4/8

7:40 am-3:12 pm

1 stop8h 32m

$441

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 8/7

2:15 pm-12:20 am

1 stop9h 05m

Chicago O'Hare Intl

Thu 8/14

7:10 am-1:29 pm

1 stop7h 19m

$510

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 5/13

5:30 am-12:21 pm

1 stop5h 51m

$147

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 5/17

2:26 pm-11:07 pm

1 stop7h 41m

$187

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Tue 5/13

6:00 am-1:05 pm

1 stop6h 05m

$194

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 5/15

5:09 pm-5:40 am

1 stop11h 31m

$240

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

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.

Travel insights for flights from Great Falls to Illinois

Get recent, data-driven insights about flights from Great Falls to Illinois including ideal travel times, pricing trends, and more.

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.

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 February 20, 2025.
Alaska Airlines
8.0
Very good
9,692 reviews

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines
8.0
Very good
9,692 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta
8.0
Very good
8,220 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Hawaiian Airlines
7.9
Good
2,317 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines
7.4
Good
8,766 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Comfort

7.9

Food

7.1

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 airlines to fly from Great Falls to Illinois one-way?

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $147. United Airlines flights start at $187 while deals on Alaska Airlines start at $240 one-way.

  • 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 3 airlines flying from Great Falls to Illinois

Discover the top 3 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$205Average$588FlexibilityNo cancel feeOn-time75%
DeltaCheapest$226Average$378FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$302Average$545FlexibilityNo cancel feeOn-time69%
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