$667 Cheap Flights from Oslo (OSL) to Ontario (ONT)

View $667 flight on Mon, Mar 16, 2026Opens in a new window

Popular airlines from Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Oslo to Ontario (OSL-ONT)

Prices were available within the past 7 days and start at $667 for one-way flights and $489 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$489 Roundtrip, found 15 hours ago
$489
Roundtrip
found 15 hours ago
Select British Airways flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $489 found 15 hours ago
British Airways
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$509 Roundtrip, found 15 hours ago
$509
Roundtrip
found 15 hours ago
Select British Airways flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $509 found 15 hours ago
British Airways
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$515 Roundtrip, found 15 hours ago
$515
Roundtrip
found 15 hours ago
Select British Airways flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $515 found 15 hours ago
British Airways
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$517 Roundtrip, found 15 hours ago
$517
Roundtrip
found 15 hours ago
Select British Airways flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $517 found 15 hours ago
British Airways
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$524 Roundtrip, found 15 hours ago
$524
Roundtrip
found 15 hours ago
Select British Airways flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $524 found 15 hours ago
American Airlines
Wed, Sep 17 - Wed, Sep 24
OSL
Oslo
ONT
Ontario
$535 Roundtrip, found 3 hours ago
$535
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Sep 17 from Oslo to Ontario, returning Wed, Sep 24, priced at $535 found 3 hours ago
British Airways
Wed, Sep 17 - Wed, Sep 24
OSL
Oslo
ONT
Ontario
$537 Roundtrip, found 3 hours ago
$537
Roundtrip
found 3 hours ago
Select British Airways flight, departing Wed, Sep 17 from Oslo to Ontario, returning Wed, Sep 24, priced at $537 found 3 hours ago
Delta
Wed, Sep 17 - Wed, Sep 24
OSL
Oslo
ONT
Ontario
$542 Roundtrip, found 3 hours ago
$542
Roundtrip
found 3 hours ago
Select Delta flight, departing Wed, Sep 17 from Oslo to Ontario, returning Wed, Sep 24, priced at $542 found 3 hours ago
Brussels Airlines
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$553 Roundtrip, found 15 hours ago
$553
Roundtrip
found 15 hours ago
Select Brussels Airlines flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $553 found 15 hours ago
Finnair
Thu, Oct 2 - Thu, Oct 9
OSL
Oslo
ONT
Ontario
$564 Roundtrip, found 15 hours ago
$564
Roundtrip
found 15 hours ago
Select Finnair flight, departing Thu, Oct 2 from Oslo to Ontario, returning Thu, Oct 9, priced at $564 found 15 hours ago
Flights from Oslo (OSL) to Ontario (ONT)
Origin airport
Gardermoen
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, British Airways, Delta, KLM, United, Virgin Atlantic
Roundtrip price
$488
Distance
5305 mi

Oslo to Ontario Flights

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

 

The best time to book a flight from Oslo to Ontario

Sunday is one of the best days to book for cheap flights from Oslo 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 Oslo 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 Oslo to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $667 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 Oslo 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 Oslo 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 Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from OSL 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 OSL to ONT?
The cheapest flights from OSL 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 OSL to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from OSL to ONT. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT)?
There are no daily nonstop flights departing from Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT). But you can book flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from OSL to ONT?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can change depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid possible delays on the Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT) route, travel before 3 PM. Flights after this time have a 22% higher chance of being 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 Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until just before your departure to book a ticket from OSL to ONT generally means paying more. Although you may find some last-minute offers, there's no guarantee. Allow some flexibility in your schedule to maximize your chances of getting a bargain.
Is it cheaper to book an OSL to ONT flight and hotel package?
Compared with arranging hotels and flights separately, booking an OSL to ONT flight and hotel package with Expedia could result in significant savings. What's more, managing everything in one place takes the hassle out of travel planning. Just secure your flights and choose from our extensive range of stays, then personalize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Gardermoen Airport (OSL) to Los Angeles - Ontario Intl. Airport (ONT)?
Typically, you're able to cancel or reschedule your OSL to ONT flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you want further information, go to our Customer Service portal.

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*Available to One Key members.