$134 Cheap Flights from Great Falls (GTF) to Ontario (ONT)

View $134 flight on Wed, Oct 15, 2025Opens in a new window

Popular airlines from Great Falls, MT (GTF-Great Falls Intl.) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Great Falls to Ontario (GTF-ONT)

Prices were available within the past 7 days and start at $134 for one-way flights and $268 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, Oct 25 - Sat, Nov 1
GTF
Great Falls
ONT
Ontario
$268 Roundtrip, found 1 hour ago
$268
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Oct 25 from Great Falls to Ontario, returning Sat, Nov 1, priced at $268 found 1 hour ago
Delta
Sat, Dec 6 - Wed, Dec 10
GTF
Great Falls
ONT
Ontario
$268 Roundtrip, found 6 hours ago
$268
Roundtrip
found 6 hours ago
Select Delta flight, departing Sat, Dec 6 from Great Falls to Ontario, returning Wed, Dec 10, priced at $268 found 6 hours ago
United
Wed, Oct 8 - Sat, Oct 11
GTF
Great Falls
ONT
Ontario
$268 Roundtrip, found 8 hours ago
$268
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Oct 8 from Great Falls to Ontario, returning Sat, Oct 11, priced at $268 found 8 hours ago
Delta
Wed, Nov 5 - Wed, Nov 12
GTF
Great Falls
ONT
Ontario
$271 Roundtrip, found 2 days ago
$271
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Nov 5 from Great Falls to Ontario, returning Wed, Nov 12, priced at $271 found 2 days ago
United
Wed, Oct 8 - Sat, Oct 11
GTF
Great Falls
ONT
Ontario
$273 Roundtrip, found 8 hours ago
$273
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Oct 8 from Great Falls to Ontario, returning Sat, Oct 11, priced at $273 found 8 hours ago
Delta
Sat, Nov 1 - Tue, Nov 18
GTF
Great Falls
ONT
Ontario
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Nov 1 from Great Falls to Ontario, returning Tue, Nov 18, priced at $274 found 4 days ago
United
Wed, Oct 8 - Sat, Oct 11
GTF
Great Falls
ONT
Ontario
$275 Roundtrip, found 8 hours ago
$275
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Oct 8 from Great Falls to Ontario, returning Sat, Oct 11, priced at $275 found 8 hours ago
Hawaiian Airlines
Wed, Oct 15 - Wed, Oct 22
GTF
Great Falls
ONT
Ontario
$290 Roundtrip, found 2 days ago
$290
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Oct 15 from Great Falls to Ontario, returning Wed, Oct 22, priced at $290 found 2 days ago
Alaska Airlines
Sat, Oct 11 - Fri, Oct 31
GTF
Great Falls
ONT
Ontario
$295 Roundtrip, found 19 hours ago
$295
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Sat, Oct 11 from Great Falls to Ontario, returning Fri, Oct 31, priced at $295 found 19 hours ago
Delta
Sat, Oct 18 - Sun, Oct 26
GTF
Great Falls
ONT
Ontario
$296 Roundtrip, found 5 days ago
$296
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Oct 18 from Great Falls to Ontario, returning Sun, Oct 26, priced at $296 found 5 days ago

Find the cheapest month to fly from Great Falls (GTF) to Ontario (ONT)

January is typically the cheapest month to fly

From $218 - $948 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $573
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $573
Flights from Great Falls (GTF) to Ontario (ONT)
Origin airport
Great Falls Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$268
Distance
982 mi

Great Falls to Ontario Flights

The cheapest times to fly from Great Falls to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Great Falls to Ontario are during the month of October. You can find some of the cheapest flights from Great Falls to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Great Falls to Ontario

Sunday is one of the best days to book for cheap flights from Great Falls to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Great Falls to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Great Falls to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $134 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Great Falls to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Great Falls to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Snag a cheap one-way flight from $134 or cheap return flight from $268 from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from GTF to ONT is October, when demand is low. Off-peak months are generally when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest GTF to ONT flight.
How many flights per day from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT)?
Nonstop flights from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from GTF to ONT?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on a number of factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT)?
Select a flight from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT) that takes off before 3 PM to reduce the risk of cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Waiting until right before your break to book your flight from GTF to ONT often results in higher prices. Although you may find some last-minute deals, they aren't always guaranteed. Allow some flexibility in your schedule for the best chance of getting a bargain.
Is it cheaper to book a GTF to ONT flight and hotel package?
Compared with arranging hotels and flights separately, booking a GTF to ONT flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of stays, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Great Falls Intl. Airport (GTF) to Los Angeles - Ontario Intl. Airport (ONT)?
In most cases, you can modify or cancel your GTF to ONT flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more details, go to our Customer Service portal.

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*Available to One Key members.