Cheap flights from San Francisco to Ontario from C$ 150

In general, February is the cheapest month to fly from San Francisco to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 551. If you are unable to visit Region of Ontario during the month of February, then departing from San Francisco during the month January is also very affordable. Most momondo users find prices during this month for around C$ 551.

The cheapest day to depart from San Francisco to Region of Ontario is on a Tuesday. Travellers who choose to depart for Region of Ontario on a Tuesday will often find tickets for as low as C$ 563. The most expensive day to fly to Region of Ontario is Friday, with ticket prices averaging around C$ 781.

Our most recent data shows that the best time of day to fly to Region of Ontario is at noon. Flights from San Francisco to Region of Ontario during this time can be as low as C$ 616. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are C$ 823 on average. Flights to Region of Ontario from San Francisco in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 C$ 717 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 C$ 641 on momondo.

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

Porter Airlines, Air Canada and United Airlines are the top three most popular airlines that fly to Region of Ontario from San Francisco according to our data. Porter Airlines is the first choice among our users, with 43% of people opting to fly with this airline when travelling 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 September 2026, 25 flights take off from San Francisco and land in Region of Ontario each day. The most common flight departure time for this route is 8:00a.m., with 49% of daily flights taking off at noon.

The number of flights available between San Francisco and Region of Ontario is 180 per week as of September 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.