$190 Cheap Flights from San José (SJO) to Ontario (ONT)

View $190 flight on Thu, Aug 14, 2025Opens in a new window

Popular airlines from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from San José to Ontario (SJO-ONT)

Prices were available within the past 7 days and start at $190 for one-way flights and $323 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Dec 25 - Wed, Jan 7
SJO
San José
ONT
Ontario
$323 Roundtrip, found 2 days ago
$323
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 25 from San José to Ontario, returning Wed, Jan 7, priced at $323 found 2 days ago
American Airlines
Tue, Sep 9 - Tue, Sep 16
SJO
San José
ONT
Ontario
$333 Roundtrip, found 13 hours ago
$333
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Tue, Sep 9 from San José to Ontario, returning Tue, Sep 16, priced at $333 found 13 hours ago
American Airlines
Tue, Sep 9 - Tue, Sep 16
SJO
San José
ONT
Ontario
$338 Roundtrip, found 13 hours ago
$338
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Tue, Sep 9 from San José to Ontario, returning Tue, Sep 16, priced at $338 found 13 hours ago
United
Thu, Oct 30 - Sun, Nov 2
SJO
San José
ONT
Ontario
$339 Roundtrip, found 1 day ago
$339
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 30 from San José to Ontario, returning Sun, Nov 2, priced at $339 found 1 day ago
American Airlines
Fri, Jul 25 - Sat, Aug 23
SJO
San José
ONT
Ontario
$341 Roundtrip, found 2 days ago
$341
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Jul 25 from San José to Ontario, returning Sat, Aug 23, priced at $341 found 2 days ago
American Airlines
Sun, Aug 3 - Fri, Aug 8
SJO
San José
ONT
Ontario
$343 Roundtrip, found 1 day ago
$343
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sun, Aug 3 from San José to Ontario, returning Fri, Aug 8, priced at $343 found 1 day ago
United
Tue, Sep 9 - Tue, Sep 16
SJO
San José
ONT
Ontario
$343 Roundtrip, found 13 hours ago
$343
Roundtrip
found 13 hours ago
Select United flight, departing Tue, Sep 9 from San José to Ontario, returning Tue, Sep 16, priced at $343 found 13 hours ago
Southwest Airlines
Fri, Sep 19 - Wed, Oct 1
SJO
San José
ONT
Ontario
$352 Roundtrip, found 3 days ago
$352
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Fri, Sep 19 from San José to Ontario, returning Wed, Oct 1, priced at $352 found 3 days ago
Delta
Wed, Sep 24 - Thu, Sep 25
SJO
San José
ONT
Ontario
$363 Roundtrip, found 2 days ago
$363
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Sep 24 from San José to Ontario, returning Thu, Sep 25, priced at $363 found 2 days ago
JetBlue Airways
Tue, Sep 9 - Tue, Sep 16
SJO
San José
ONT
Ontario
$483 Roundtrip, found 13 hours ago
$483
Roundtrip
found 13 hours ago
Select JetBlue Airways flight, departing Tue, Sep 9 from San José to Ontario, returning Tue, Sep 16, priced at $483 found 13 hours ago

Find the cheapest month to fly from San José (SJO) to Ontario (ONT)

September is typically the cheapest month to fly

From $304 - $1,256 per traveler.

Graph displaying average flight prices per month

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 $363
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $363
Flights from San José (SJO) to Ontario (ONT)
Origin airport
Juan Santamaría Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Air Canada, American Airlines, Delta, JetBlue Airways, Southwest Airlines, United, avianca
Roundtrip price
$322
Distance
2686 mi

San José to Ontario Flights

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

 

The best time to book a flight from San José to Ontario

Sunday is one of the best days to book for cheap flights from San José 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 San José 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 San José to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $190 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 San José 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 San José 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 Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from SJO 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 SJO to ONT?
The cheapest flights from SJO 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 SJO to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SJO to ONT. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT)?
There aren't any daily nonstop flights from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from SJO to ONT?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, airline 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 Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT)?
Book a flight from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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.
What airports do you fly into for Ontario from Juan Santamaria Intl. Airport (SJO)?
Los Angeles Intl. Airport (LAX) is the only airport in Ontario with direct flights from Juan Santamaria Intl. Airport (SJO). Browse the options and find cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute fares from SJO to ONT are generally more expensive. To secure the lowest rates, start searching for flights well in advance. That being said, if you're flexible with your travel plans, it's possible to find a cheap fare right before your trip.
Is it cheaper to book a SJO to ONT flight and hotel package?
Compared with arranging flights and hotels separately, booking a SJO to ONT flight and hotel package with Expedia could result in significant savings. Better yet, having it all in one place will take the stress out of planning your trip. Simply secure your flights and select from our wide range of hotels, then tailor your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Juan Santamaria Intl. Airport (SJO) to Los Angeles - Ontario Intl. Airport (ONT)?
If you reserved your SJO to ONT flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.