Cheap flights from Ottawa to San Francisco from C$ 236

The cheapest month to fly to San Francisco from Ottawa is in September. Flight prices, which tend to average around C$ 498, are often lower during this time because this is during the off-season. The month of November is another great option to travel to San Francisco, with average flight prices from Ottawa averaging around C$ 544.

You are more likely to see cheaper flights to San Francisco from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around C$ 635 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Ottawa for as low as C$ 457 on momondo.

You could potentially save up to 7% on your flight if you consider stops on a Ottawa to San Francisco flight.

As of September 2026, prices for Ottawa to San Francisco flights are approximately 8% cheaper when compared to flights at the same time last year.

WestJet, Delta, and Porter Airlines are the most popular carriers operating from Ottawa to San Francisco

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to San Francisco from Ottawa according to our data. Air Canada is the first choice among our users, with 54% 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.

Toronto (YYZ) was the most common stop: 78% of momondo users choosing one-stop flights on this route connected there.

Flights via Calgary (YYC) offer the lowest average round-trip price of C$ 538.

Flights connecting via Toronto (YYZ) have the shortest average one-way travel time: 8h 56m.

Toronto (YYZ) has the shortest average layover time for this route: 1h 48m.