Cheap flights from Montreal to San Francisco from C$ 279

The cheapest month to fly to San Francisco from Montreal is in August. Flight prices, which tend to average around C$ 568, are often lower during this time because this is during the off-season. The month of October is another great option to travel to San Francisco, with average flight prices from Montreal averaging around C$ 571.

The cheapest day to depart from Montreal 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$ 1,124. On the other hand, Saturday is the most expensive day to depart from Montreal because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 1,277.

Flying to San Francisco from Montreal in the morning is the least expensive time of day to depart. momondo users have found prices as low as C$ 878 when looking at flights departing in the morning. In contrast, the most expensive time of day to depart to San Francisco is in the afternoon when prices are around C$ 1,259.

Fly from Montreal Pierre Elliott Trudeau Intl to San Francisco for the best Montreal - San Francisco flight prices

You are more likely to see cheaper flights to San Francisco from Montreal when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around C$ 609 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Montreal for as low as C$ 501 on momondo.

There are 3 cabin classes available to choose from on Montreal to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 12% on your flight if you consider stops on a Montreal to San Francisco flight.

As of April 2026, prices for Montreal to San Francisco flights are approximately 17% cheaper when compared to flights at the same time last year.

WestJet, United Airlines, and Delta are the most popular carriers operating from Montreal to San Francisco

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to San Francisco from Montreal according to our data. Air Canada is the first choice among our users, with 66% of people opting to fly with this airline when travelling to San Francisco. Keep in mind that there are 5 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

Historically, on average around 21% of flights between Montreal and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 143 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, Air Canada has had the least delays on this route over the last 12 months, with about 20% of their flights experiencing any sort of delay.

Toronto (YYZ) was the most common stop: 86% of momondo users choosing one-stop flights on this route connected there.

Flights via Toronto (YYZ) offer the lowest average round-trip price of C$ 465.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 7h 56m.

Toronto (YYZ) has the shortest average layover time for this route: 1h 33m.

3 flights are operational daily from Montreal to San Francisco as of April 2026. The most popular departure time for this route is 6:00p.m., with 100% of flights per day taking off in the evening.

26 flights are operational weekly from Montreal to San Francisco as of April 2026. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.