$90 Find cheap flights from San Diego to Ontario

In the last 3 days, the lowest price for a flight from San Diego to Ontario was $90 for a one-way ticket and $382 for a round-trip.

No, a passport isn't needed to fly from San Diego to Ontario. However, local authorities might ask for an official ID.

San Diego and Ontario are both served by 1 main airport. You will leave San Diego from San Diego and will be arriving at Ontario.

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

oneworld, and Star Alliance are the airline alliances operating flights between San Diego and Ontario, 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 San Diego to Ontario.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from San Diego 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 Ontario with an airline and back to San Diego with another airline. Booking your flights between San Diego and ONT 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 Ontario from San Diego up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.