£245 Cheap Flights from Ontario (ONT) to San Diego (SAN)

View £245 flight on Fri, 2 Jan 2026Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)

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

Prices were available within the past 7 days and start at £245 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Find the cheapest month to fly from Ontario (ONT) to San Diego (SAN)

August is typically the cheapest month to fly

From £120 - £547 per traveller.

Graph displaying average flight prices per month

Flight from Ontario to San Diego route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
San Diego Intl.
Distance
151 km

Compare flights from Ontario to San Diego easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario to San Diego. Operating between them flights per day, 14 airlines cover the route. And fly direct, getting you to San Diego Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Los Angeles - Ontario Intl. to San Diego Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Los Angeles - Ontario Intl. (ONT) to San Diego Intl. (SAN)

The easiest way to view the best deals on flights from Ontario to San Diego today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Los Angeles - Ontario Intl. to San Diego Intl. start at just and range up to .  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Ontario and San Diego
  • booking your flight during , the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ontario to San Diego flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Los Angeles - Ontario Intl. to San Diego Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Frequently asked questions

How much is a flight from ONT to San Diego Airport?
Start packing your suitcase, because round-trip journeys between ONT and San Diego Airport start from . That's based on fares listed within the last 7 days on Expedia for flights departing within the next year. Prices can rise quickly, so book now to secure the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from ONT to San Diego Airport?
We understand that things come up unexpectedly, so we've made it as easy as possible for you to cancel your flight online. Just visit the Customer Service Portal and follow the instructions.
How do I find cheap flights from Los Angeles - Ontario Intl. Airport (ONT) to SAN that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for ONT to San Diego Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Los Angeles - Ontario Intl. Airport (ONT) to SAN?
You can forget about a movie marathon on this flight — it's just 150 kilometres from Ontario to San Diego. Sit down, get comfortable and you'll be touching down before long.
Which airlines fly direct from Ontario Airport to SAN?
You won't find any airlines operating directly between ONT and San Diego Airport, so be ready to make at least one stop on your journey. A layover, whether short or long, can be a good way to break up a trip!
Are Los Angeles - Ontario Intl. Airport (ONT) to San Diego Airport flight tickets cheaper when they're purchased at the last minute?
It is possible to pick up a fantastic last-minute deal from ONT to San Diego Intl. Airport (SAN), but it can also be hit-or-miss. As many airlines release seats up to a year in advance, it's worthwhile keeping an eye on fares early and being ready to pounce when you spot a good bargain. Expedia compares air carrier prices and updates flight deals all the time, so you can rest easy knowing you're always getting the latest offers.

Explore a world of travel with Expedia

Ontario Airports

Los Angeles

Los Angeles Intl. to San Diego
£104.30

Burbank

Hollywood Burbank to San Diego
£175.90

Orange County

John Wayne to San Diego
£232.30
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