Cheap flights from Ottawa to San Francisco from C$ 221

The cheapest month to fly to San Francisco from Ottawa is in September. Flight prices, which tend to average around C$ 476, 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 Ottawa averaging around C$ 485.

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$ 566 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$ 438 on momondo.

You could potentially save up to 30% on your flight if you consider stops on a Ottawa to San Francisco flight.

As of April 2026, prices for Ottawa to San Francisco flights are approximately 34% cheaper when compared to flights at the same time last year.

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

Air Canada, Porter Airlines and WestJet 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 52% 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: 76% 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$ 399.

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 8h 33m.

Montreal (YUL) has the shortest average layover time for this route: 1h 18m.