$191 Find cheap flights from Ontario to San Diego

In the last 3 days, the lowest price for a flight from Ontario to San Diego was $191 for a one-way ticket and $372 for a round-trip.

A passport is not required to fly from Ontario to San Diego.

We unfortunately don’t have that data for this specific route.

oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Ontario and San Diego, with oneworld being the most commonly used for this route.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Diego.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Diego with an airline and back to Ontario with another airline. Booking your flights between Ontario and SAN can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.