Cheap flights from Ontario to San Francisco from C$ 204

The cheapest month to fly to San Francisco from Region of Ontario is in April. Flight prices, which tend to average around C$ 439, are often lower during this time because this is during the off-season. The month of March is another great option to travel to San Francisco, with average flight prices from Region of Ontario averaging around C$ 448.

The cheapest day to depart from Region of Ontario to San Francisco is on a Friday. Travellers who choose to depart for San Francisco on a Friday will often find tickets for as low as C$ 762. On the other hand, Sunday is the most expensive day to depart from Region of Ontario because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 1,186.

Flying to San Francisco from Region of Ontario at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 675 when looking at flights departing at noon. In contrast, the most expensive time of day to depart to San Francisco is in the evening when prices are around C$ 1,399.

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

You are more likely to see cheaper flights to San Francisco from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around C$ 503 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Region of Ontario for as low as C$ 423 on momondo.

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

Porter Airlines, Air Canada and United Airlines are the top three most popular airlines that fly to San Francisco from Region of Ontario according to our data. Porter Airlines is the first choice among our users, with 39% of people opting to fly with this airline when travelling to San Francisco. Keep in mind that there are 9 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

The number of flights available between Region of Ontario and San Francisco is 19 per day as of February 2026. The most frequent departure time is 6:00p.m., with 59% of daily flights leaving at noon.

The number of flights available between Region of Ontario and San Francisco is 133 per week as of February 2026. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.