Cheap flights from San Diego to Ontario from C$ 186

In general, March is the cheapest month to fly from San Diego to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 597. If you are unable to visit Region of Ontario during the month of March, then departing from San Diego during the month May is also very affordable. Most momondo users find prices during this month for around C$ 633.

The cheapest day to depart from San Diego to Region of Ontario is on a Sunday. Travellers who choose to depart for Region of Ontario on a Sunday will often find tickets for as low as C$ 149. The most expensive day to fly to Region of Ontario is Wednesday, with ticket prices averaging around C$ 787.

Our most recent data shows that the best time of day to fly to Region of Ontario is in the morning. Flights from San Diego to Region of Ontario during this time can be as low as C$ 500. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 672 on average. Flights to Region of Ontario from San Diego at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to Region of Ontario from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around C$ 747 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from San Diego for as low as C$ 488 on momondo.

There are 2 cabin classes available to choose from on San Diego to Region of Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

Air Canada, Delta and United Airlines are the top three most popular airlines that fly to Region of Ontario from San Diego according to our data. Air Canada is the first choice among our users, with 51% of people opting to fly with this airline when travelling to Region of Ontario. Keep in mind that there are 3 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

As of August 2026, there are 2 flights per day flying from San Diego to Region of Ontario. The most common time of day flights depart is 12:00p.m., with 100% of flights taking off in the afternoon.

As of August 2026, 18 flights take off from San Diego and land in Region of Ontario each week. The most common flight departure day for this route is Fri, with 22% of weekly flights taking off on this day.