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$129+ 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
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$278
(Delta)

One-way from

$129
(Delta)

Popular in

June

Cheapest in

September

Average price

$518

Good one-way deal

$319 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. 25% potential increase in price ($179 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This Delta deal was found by Cheapflights users on 3/25. 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 4/85:56 amGTF - MDW
1 stop7h 21mDelta
Tue 4/151:16 pmMDW - GTF
1 stop8h 17mDelta
Deal found 3/25$278
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Mon 4/286:07 pmGTF - ORD
1 stop10h 58mAlaska Airlines
Thu 5/17:19 pmORD - GTF
1 stop23h 08mAlaska Airlines
Deal found 3/27$307
This United Airlines deal was found by Cheapflights users on 3/27. 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 8/72:35 pmGTF - ORD
1 stop6h 59mUnited Airlines
Thu 8/148:45 amORD - GTF
1 stop13h 28mUnited Airlines
Deal found 3/27$406
This Mytrip deal was found by Cheapflights users on 3/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/285:34 pmGTF - ORD
2 stops29h 46mMultiple Airlines
Thu 5/111:45 amORD - GTF
3 stops29h 59mMultiple Airlines
Deal found 3/27$418
This Delta deal was found by Cheapflights users on 3/27. 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 5/136:00 amGTF - ORD
2 stops11h 37mDelta
Fri 5/168:40 amORD - GTF
2 stops9h 56mDelta
Deal found 3/27$439

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 March 28, 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 - MDW

GTFMDW

Great Falls

Tue 4/8

5:56 am-2:17 pm

1 stop7h 21m

Chicago Midway

Tue 4/15

1:16 pm-8:33 pm

1 stop8h 17m

$278

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 4/28

6:07 pm-6:05 am

1 stop10h 58m

Chicago O'Hare Intl

Thu 5/1

7:19 pm-5:27 pm

1 stop23h 08m

$307

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Thu 8/7

2:35 pm-10:34 pm

1 stop6h 59m

Chicago O'Hare Intl

Thu 8/14

8:45 am-9:13 pm

1 stop13h 28m

$406

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 4/28

5:34 pm-12:20 am

2 stops29h 46m

Chicago O'Hare Intl

Thu 5/1

11:45 am-4:44 pm

3 stops29h 59m

$418

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Tue 5/13

6:00 am-6:37 pm

2 stops11h 37m

Chicago O'Hare Intl

Fri 5/16

8:40 am-5:36 pm

2 stops9h 56m

$439

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

Tue 5/13

6:00 am-1:15 pm

1 stop6h 15m

$129

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sun 6/22

5:45 am-11:53 am

1 stop5h 08m

$129

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sun 4/27

6:07 pm-6:05 am

1 stop10h 58m

$135

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Mon 4/21

5:34 pm-5:45 am

2 stops35h 11m

$164

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

Sat 7/26

6:25 am-12:30 am

1 stop17h 05m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

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 March 28, 2025.
Read through reviews of airlines operating flights from Great Falls to Illinois, such as Alaska Airlines, 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.
Alaska Airlines
8.0
Very good
9,798 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

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
9,798 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

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
7,897 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

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
8,603 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

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 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 $317 while the most popular route, (Great Falls - Chicago O'Hare Intl) is currently priced at $298.

  • 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 $323). 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$205Average$588FlexibilityNo cancel feeOn-time75%
DeltaCheapest$226Average$408FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$302Average$496FlexibilityNo cancel feeOn-time69%
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