Cheap flights from Ontario to San Francisco from $149

If you aren’t able to travel to San Francisco during the month of April, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $327.

The cheapest day to depart from Region of Ontario to San Francisco is on a Thursday when prices can be found for as low as $450. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $701.

Our data shows that the cheapest Region of Ontario to San Francisco flights are usually those with departure times in the morning. Our users have found flights to San Francisco in the morning for as low as $466. Flights in the evening are often more expensive with an average ticket price of $950.

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 $368 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 $309 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 Porter Airlines are the most popular carriers operating from Ontario to San Francisco

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to San Francisco from Region of Ontario 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 San Francisco. Keep in mind that there are 7 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

As of February 2026, 19 flights take off from Region of Ontario and land in San Francisco each day. The most common flight departure time for this route is 6:00PM, with 59% of daily flights taking off 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.