Cheap flights from San Francisco to Ontario from $155

The month of February is, on average, the cheapest month to fly to Region of Ontario from San Francisco, with most prices found around $394. If you aren’t able to travel during the month of February, then book flights to Region of Ontario from San Francisco during January instead. Flights to Region of Ontario in January, while not as cheap as those in February, still average around $394.

According to our data, Wednesday is the cheapest day to fly to Region of Ontario from San Francisco. The lowest ticket price found for a Wednesday departure recently was $602. 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 Francisco to Region of Ontario on a Sunday will generally be more expensive and average around $733. 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 Francisco to Region of Ontario at noon for as low as $545. 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 $761.

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

You are more likely to see cheaper flights to Region of Ontario from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $497 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 Francisco for as low as $452 on momondo.

There are 4 cabin classes available to choose from on San Francisco 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, Delta, and Air Canada are the most popular carriers operating from San Francisco to Ontario

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to Region of Ontario from San Francisco according to our data. Air Canada is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 8 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

The number of flights available between San Francisco and Region of Ontario is 29 per day as of August 2026. The most frequent departure time is 1:00PM, with 52% of daily flights leaving at noon.

The number of flights available between San Francisco and Region of Ontario is 207 per week as of August 2026. The most frequent departure day is Sun, with 16% of weekly flights leaving on this day.