Cheap Flights from San Diego (SAN) to Ontario (ONO)

Popular airlines from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)

Black Friday Sale

Limited-time deals: Save up to 50% on select hotels.
Book now
Flights from San Diego (SAN) to Ontario (ONO)
Origin airport
San Diego Intl.
Destination airport
Ontario Municipal
Distance
787 mi

San Diego to Ontario Flights

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

 

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

Sunday is one of the best days to book for cheap flights from San Diego 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 Diego 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 Diego to Ontario in 2026. You can also book with separate airlines for your outbound and return journeys, from 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 Diego 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 Diego 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 San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal) cost?
Grab a cheap one-way flight or cheap return flight from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)?
The cheapest month to fly from SAN to ONO is , when there's less demand. Off-peak season is generally when better flight deals are available between these airports.
What is the cheapest airline that flies from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll fly you from SAN to ONO. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)?
Nonstop flights from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SAN to ONO?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)?
To reach Ontario, OR (ONO-Ontario Municipal) on schedule, pick a flight that leaves San Diego Intl. Airport (SAN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 San Diego Intl. Airport (SAN)?
Check out your flight options from San Diego Intl. Airport (SAN) to Boise Airport (BOI). This is the only airport in Ontario you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal) last-minute?
Last-minute bookings from SAN to ONO are usually more expensive. To lock in the lowest prices, start looking for flights well ahead of time. That being said, if you can play around with your travel dates, you may land a cheap ticket right before your journey.
Is it cheaper to book a SAN to ONO flight and hotel package?
You'll generally save money by securing a SAN to ONO flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. After selecting your ideal flights and accommodations, consider adding extras including tours, car rentals and activities.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Ontario, OR (ONO-Ontario Municipal)?
Typically, it's possible to reschedule or cancel your SAN to ONO flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check 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.