Cheap flights from Ontario to San Diego from $136

If you are unable to visit San Diego during the month of April, then departing from Region of Ontario during the month March is also very affordable. Most momondo users find prices during this month for around $329.

The cheapest day to depart from Region of Ontario to San Diego is on a Friday. Travelers who choose to depart for San Diego on a Friday will often find tickets for as low as $272. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $471. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

Fly from Toronto Pearson Intl to San Diego for the best Ontario - San Diego flight prices

You are more likely to see cheaper flights to San Diego from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $392 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Region of Ontario for as low as $304 on momondo.

There are 3 cabin classes available to choose from on Ontario to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 45% on your flight if you consider stops on a Region of Ontario to San Diego flight.

American Airlines, WestJet, and United Airlines are the most popular carriers operating from Ontario to San Diego

Air Canada, United Airlines and Porter Airlines are the top three most popular airlines that fly to San Diego from Region of Ontario according to our data. Air Canada is the first choice among our users, with 59% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 5 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

As of February 2026, 2 flights take off from Region of Ontario and land in San Diego each day. The most common flight departure time for this route is 9:00AM, with 100% of daily flights taking off at noon.

The number of flights available between Region of Ontario and San Diego is 14 per week as of February 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.