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$128+ 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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$304
(Alaska Airlines)

One-way from

$128
(Delta)

Popular in

November

Cheapest in

September

Average price

$528

Good round-trip deal

$571 or less

Good one-way deal

$264 or less
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. 13% potential increase in price ($79 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Great Falls to Illinois.
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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 junio 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/11. 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.
vie. 8/294:29 pmGTF - ORD
1 stop13h 34mAlaska Airlines
mar. 9/28:00 amORD - GTF
1 stop8h 49mAlaska Airlines
Deal found 6/11$304
This United Airlines deal was found by Cheapflights users on 6/11. 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.
mié. 10/12:31 pmGTF - ORD
1 stop7h 08mUnited Airlines
jue. 10/92:53 pmORD - GTF
1 stop7h 18mUnited Airlines
Deal found 6/11$328
This Mytrip deal was found by Cheapflights users on 6/10. 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.
vie. 8/110:14 amGTF - ORD
1 stop18h 49mMultiple Airlines
sáb. 8/97:49 pmORD - GTF
3 stops24h 23mMultiple Airlines
Deal found 6/10$371
This Delta deal was found by Cheapflights users on 6/11. 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.
sáb. 6/286:18 pmGTF - MDW
2 stops13h 23mDelta
sáb. 7/51:09 pmMDW - GTF
2 stops8h 23mDelta
Deal found 6/11$440
This Delta deal was found by Cheapflights users on 6/9. 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.
lun. 6/236:18 pmGTF - ORD
2 stops12h 31mDelta
vie. 7/112:00 pmORD - GTF
2 stops9h 45mDelta
Deal found 6/9$498

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 junio 12, 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

vie. 8/29

4:29 pm-7:03 am

1 stop13h 34m

Chicago O'Hare Intl

mar. 9/2

8:00 am-3:49 pm

1 stop8h 49m

$304

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

mié. 8/20

2:35 pm-11:59 pm

1 stop8h 24m

Chicago O'Hare Intl

dom. 8/24

7:15 am-1:37 pm

1 stop7h 22m

$338

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

vie. 8/1

10:14 am-6:03 am

1 stop18h 49m

Chicago O'Hare Intl

sáb. 8/9

7:49 pm-7:12 pm

3 stops24h 23m

$371

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

sáb. 6/28

6:18 pm-8:41 am

2 stops13h 23m

Chicago Midway

sáb. 7/5

1:09 pm-8:32 pm

2 stops8h 23m

$440

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

lun. 6/23

6:18 pm-7:49 am

2 stops12h 31m

Chicago O'Hare Intl

vie. 7/11

2:00 pm-10:45 pm

2 stops9h 45m

$498

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

mié. 7/2

5:42 am-11:52 am

1 stop5h 10m

$128

Great FallsChicago

GTF - MDW

GTFMDW

Great Falls

sáb. 9/6

5:45 am-5:37 pm

2 stops10h 52m

$134

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

mié. 7/2

10:19 pm-8:50 am

2 stops33h 31m

$144

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

dom. 8/24

4:29 pm-10:04 pm

1 stop28h 35m

$221

Great FallsChicago

GTF - ORD

GTFORD

Great Falls

sáb. 7/19

12:59 pm-5:10 pm

Nonstop3h 11m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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

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

Find hourly flight availability from Great Falls to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated junio 12, 2025.

When flying from Great Falls to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 junio 12, 2025.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $128. Alaska Airlines flights start at $221 while deals on United Airlines start at $284 one-way.

  • What are the cheapest flights from Great Falls to Illinois?

    On average you can expect to pay $511 for a flight from Great Falls to Illinois. The cheapest flight overall is $264 while the most popular route, (Great Falls - Chicago O'Hare Intl) is currently priced at $328.

  • 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.

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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$205Average$588FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$302Average$447FlexibilityNo cancel feeOn-time69%

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