Cheap flights from San Francisco to Bilbao from $351

The cheapest month to fly to Bilbao from San Francisco is in October. Flight prices, which tend to average around $552, are often lower during this time because this is during the off-season. If you’re not able to fly to Bilbao in October, then November is your next best option. Flight prices from San Francisco to Bilbao during November average around $625.

You are more likely to see cheaper flights to Bilbao from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Bilbao for around $788 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bilbao from San Francisco for as low as $647 on momondo.

You could potentially save up to 19% on your flight if you consider stops on a San Francisco to Bilbao flight.

As of May 2026, prices for San Francisco to Bilbao flights are approximately 36% cheaper when compared to flights at the same time last year.

KLM and Delta are the most popular carriers operating from San Francisco to Bilbao

Lufthansa, United Airlines and KLM are the top three most popular airlines that fly to Bilbao from San Francisco according to our data. Lufthansa is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Bilbao. Keep in mind that there are 5 different airlines that fly to Bilbao on a routine basis, so you have a few additional options to choose from.

Lisbon (LIS) was the most common stop: 29% of momondo users choosing 1-stop flights on this route connected there.

Flights via Barcelona (BCN) offer the lowest average round-trip price of $461.

Flights connecting via Paris (CDG) have the shortest average one-way travel time: 16h 40m.

Paris (CDG) has the shortest average layover time for this route: 2h 45m.