$120 Cheap Flights from Missoula (MSO) to Ontario (ONT)

View $120 flight on Fri, Jun 6, 2025Opens in a new window
Find available prices by choosing your travel dates.

Cheap Flights from Missoula to Ontario (MSO-ONT)

Prices were available within the past 7 days and start at $120 for one-way flights and $228 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, May 30 - Mon, Jun 2
MSO
Missoula
ONT
Ontario
$228 Roundtrip, found 5 hours ago
$228
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Fri, May 30 from Missoula to Ontario, returning Mon, Jun 2, priced at $228 found 5 hours ago
Alaska Airlines
Fri, May 30 - Mon, Jun 2
MSO
Missoula
ONT
Ontario
$242 Roundtrip, found 3 days ago
$242
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Fri, May 30 from Missoula to Ontario, returning Mon, Jun 2, priced at $242 found 3 days ago
Hawaiian Airlines
Tue, May 20 - Wed, May 21
MSO
Missoula
ONT
Ontario
$244 Roundtrip, found 5 hours ago
$244
Roundtrip
found 5 hours ago
Select Hawaiian Airlines flight, departing Tue, May 20 from Missoula to Ontario, returning Wed, May 21, priced at $244 found 5 hours ago
Frontier Airlines
Fri, Jun 6 - Tue, Jun 10
MSO
Missoula
ONT
Ontario
$249 Roundtrip, found 7 hours ago
$249
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Fri, Jun 6 from Missoula to Ontario, returning Tue, Jun 10, priced at $249 found 7 hours ago
Hawaiian Airlines
Fri, May 16 - Tue, May 20
MSO
Missoula
ONT
Ontario
$254 Roundtrip, found 12 hours ago
$254
Roundtrip
found 12 hours ago
Select Hawaiian Airlines flight, departing Fri, May 16 from Missoula to Ontario, returning Tue, May 20, priced at $254 found 12 hours ago
Bargain Flight
Tue, Jun 3 - Tue, Jun 10
MSO
Missoula
ONT
Ontario
$257 Roundtrip, found 6 hours ago
$257
Roundtrip
found 6 hours ago
Select Bargain Flight flight, departing Tue, Jun 3 from Missoula to Ontario, returning Tue, Jun 10, priced at $257 found 6 hours ago
Alaska Airlines
Tue, Jun 3 - Tue, Jun 10
MSO
Missoula
ONT
Ontario
$258 Roundtrip, found 6 hours ago
$258
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Tue, Jun 3 from Missoula to Ontario, returning Tue, Jun 10, priced at $258 found 6 hours ago
United
Tue, Jun 3 - Tue, Jun 17
MSO
Missoula
ONT
Ontario
$259 Roundtrip, found 1 day ago
$259
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jun 3 from Missoula to Ontario, returning Tue, Jun 17, priced at $259 found 1 day ago
Delta
Tue, Jun 3 - Tue, Jun 10
MSO
Missoula
ONT
Ontario
$259 Roundtrip, found 6 hours ago
$259
Roundtrip
found 6 hours ago
Select Delta flight, departing Tue, Jun 3 from Missoula to Ontario, returning Tue, Jun 10, priced at $259 found 6 hours ago
Delta
Tue, Jun 3 - Tue, Jun 10
MSO
Missoula
ONT
Ontario
$263 Roundtrip, found 6 hours ago
$263
Roundtrip
found 6 hours ago
Select Delta flight, departing Tue, Jun 3 from Missoula to Ontario, returning Tue, Jun 10, priced at $263 found 6 hours ago
Flights from Missoula (MSO) to Ontario (ONT)
Origin airport
Missoula Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, United
Roundtrip price
$228
Distance
906 mi

Missoula to Ontario Flights

The cheapest times to fly from Missoula 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 Missoula to Ontario are during the month of May. You can find some of the cheapest flights from Missoula to Ontario with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Missoula to Ontario

Sunday is one of the best days to book for cheap flights from Missoula 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 Missoula 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 Missoula to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $120 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 Missoula 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 Missoula 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 Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from MSO to ONT by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from MSO to ONT?
The cheapest flights from MSO to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from MSO to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from MSO to ONT. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
You’ll have to catch a flight with a layover if you’re traveling from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from MSO to ONT?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a range of factors, including the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid potential delays on the Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT) route, aim to travel before 3 PM. Later flights have a 22% higher chance of cancellation.**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 Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute fares from MSO to ONT are generally more expensive. For the best prices, start searching for flights as soon as possible. That being said, if your travel plans are flexible, you may find a cheap fare right before your trip.
Is it cheaper to book a MSO to ONT flight and hotel package?
Compared with arranging flights and hotels separately, booking a MSO to ONT flight and hotel package with Expedia could result in significant savings. Better still, having it all in one place takes the hassle out of planning your trip. Simply secure your flights and choose from our extensive range of hotels, then personalize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
Usually, it’s possible to reschedule or cancel your MSO to ONT flight. However, for bookings made more than 24 hours ago, additional charges may apply. Refer to your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find more details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.