Cheap flights from San Diego to Ontario from $144

The month of March is, on average, the cheapest month to fly to Region of Ontario from San Diego, with most prices found around $434. If you aren’t able to travel during the month of March, then book flights to Region of Ontario from San Diego during May instead. Flights to Region of Ontario in May, while not as cheap as those in March, still average around $460.

According to our data, Wednesday is the cheapest day to fly to Region of Ontario from San Diego. The lowest ticket price found for a Wednesday departure recently was $540. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from San Diego to Region of Ontario on a Sunday will generally be more expensive and average around $686. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Region of Ontario is at noon. momondo users have found flights departing from San Diego to Region of Ontario at noon for as low as $540. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $618.

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 $543 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 $355 on momondo.

There are 3 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, United Airlines, and Delta are the most popular carriers operating from San Diego to Ontario

Air Canada, United Airlines and Delta 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 47% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 5 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 12:00PM, with 100% of flights taking off in the afternoon.

18 flights are operational weekly from San Diego to Region of Ontario as of August 2026. The most popular departure day for this route is Tue, with 22% of flights per week taking off on this day.