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$151+ Cheap flights from Great Falls to Ontario (GTF - ONT)

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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Great Falls to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Great Falls (GTF) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$294
(KAYAK)

One-way from

$151
(Delta)

Popular in

December

Cheapest in

February

Average price

$318
From Great Falls to Ontario
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One-way flight from Great Falls to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Great Falls to Ontario

Cheapest flights from Great Falls to Ontario
Explore the most affordable flight options available from Great Falls to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Delta deal was found by Cheapflights users on 9/16. 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.
Fri 10/246:09 pmGTF - ONT
1 stop6h 30mDelta
Tue 10/2811:48 amONT - GTF
2 stops10h 18mDelta
Deal found 9/16$296
This United Airlines deal was found by Cheapflights users on 9/16. 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 11/152:30 pmGTF - ONT
1 stop7h 14mUnited Airlines
Sun 11/165:05 amONT - GTF
1 stop7h 28mUnited Airlines
Deal found 9/16$382
This Alaska Airlines deal was found by Cheapflights users on 9/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:15 pmGTF - ONT
2 stops19h 46mAlaska Airlines
Tue 10/287:20 amONT - GTF
2 stops9h 50mAlaska Airlines
Deal found 9/16$468
This Alaska Airlines deal was found by Cheapflights users on 9/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/156:50 pmGTF - ONT
2 stops16h 08mAlaska Airlines
Sun 11/166:03 pmONT - GTF
2 stops23h 07mAlaska Airlines
Deal found 9/16$503

Cheapflights Fare Finder

 
Customize your flight search to find flights from Great Falls to Ontario 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 17, 2025.
Use the filters below to find and compare flights from Great Falls to Ontario that are best for you.

Fly from

Great Falls

Fly to

Ontario

Route

Depart

Return

Price

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Thu 1/15

4:00 pm-10:37 pm

1 stop7h 37m

Ontario

Wed 1/21

6:00 am-3:20 pm

1 stop8h 20m

$294

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Fri 10/24

6:09 pm-11:39 pm

1 stop6h 30m

Ontario

Tue 10/28

11:48 am-11:06 pm

2 stops10h 18m

$296

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Fri 10/24

6:15 pm-1:01 pm

2 stops19h 46m

Ontario

Tue 10/28

7:20 am-6:10 pm

2 stops9h 50m

$468

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Sat 11/15

6:50 pm-9:58 am

2 stops16h 08m

Ontario

Sun 11/16

6:03 pm-6:10 pm

2 stops23h 07m

$503

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Sat 11/15

6:20 am-5:34 pm

2 stops12h 14m

Ontario

Sun 11/16

5:05 am-1:33 pm

1 stop7h 28m

$528

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Tue 1/27

1:10 pm-4:19 pm

1 stop4h 09m

$151

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Sat 1/31

4:00 pm-10:37 pm

1 stop7h 37m

$151

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Wed 12/3

6:10 pm-11:59 pm

1 stop6h 49m

$151

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Sat 12/6

6:10 pm-9:56 pm

1 stop4h 46m

$151

Great FallsOntario

GTF - ONT

GTFONT

Great Falls

Wed 1/28

1:10 pm-10:38 pm

2 stops10h 28m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 15 results
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Best time to book a flight from Great Falls to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario 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 Ontario

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

Currently, August is the cheapest month in which you can book a flight from Great Falls to Ontario (average of $246). Flying from Great Falls to Ontario in March is currently the most expensive (average of $327). 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.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated September 17, 2025.
Read reviews from past customers who have flown Delta from Great Falls to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Great Falls to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Great Falls to Ontario?

    Departing from Great Falls to Ontario will take you 6h 30m. The distance from Great Falls to Ontario is about 982 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Great Falls to Ontario round-trip?

    Currently priced at $246, Delta will fly you from Great Falls to Ontario and back. In addition to Delta, many other airlines offer competitively priced options for your trip.

  • Can I find deals for flights from Great Falls to Ontario that include hotel bookings?

    Yes. In addition to deals on Great Falls to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Great Falls to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Great Falls to Ontario.

  • Can I find deals for business class flights from Great Falls to Ontario?

    Yes. Cheapflights offers flight deals from Great Falls to Ontario 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 Ontario?

    Currently, August is the cheapest month in which you can book a flight from Great Falls to Ontario (average of $246). Flying from Great Falls to Ontario in March is currently the most expensive (average of $327). 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 airline flying from Great Falls to Ontario

Discover the top airline that operate flights from Great Falls to Ontario. 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$246Average$400FlexibilityNo cancel feeOn-timeN/A

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