Cheap flights from San Francisco to Barcelona from $420

The cheapest month to fly to Barcelona-El Prat Airport from San Francisco is in January. Flight prices, which tend to average around $506, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Barcelona-El Prat Airport from San Francisco during February instead. Flights to Barcelona-El Prat Airport in February, while not as cheap as those in January, still average around $547.

The cheapest day to depart on your flight to Barcelona-El Prat Airport is on a Tuesday when prices can be found for as low as $718. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $895. These prices are subject to change though, so be sure to set up a Price Alert for flights to Barcelona-El Prat Airport.

Flying to Barcelona-El Prat Airport from San Francisco in the evening is the least expensive time of day to depart. momondo users have found prices as low as $703 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $861 on average. Flights to Barcelona-El Prat Airport from San Francisco in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from San Francisco to Barcelona-El Prat for the best San Francisco - Barcelona-El Prat flight prices

You are more likely to see cheaper flights to Barcelona-El Prat Airport from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Barcelona-El Prat Airport for around $711 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Barcelona-El Prat Airport from San Francisco for as low as $640 on momondo.

United Airlines is the most popular carrier operating from San Francisco to Barcelona-El Prat

United Airlines, Iberia and TAP AIR PORTUGAL are the top three most popular airlines that fly to Barcelona-El Prat Airport from San Francisco according to our data. United Airlines is the first choice among our users, with 61% of people opting to fly with this airline when traveling to Barcelona-El Prat Airport. Keep in mind that there are 19 different airlines that fly to Barcelona-El Prat Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 15% of flights between San Francisco and Barcelona have experienced a delay on any given week. The average delay length over the past 12 months has been 178 minutes.

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

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

According to our data, LEVEL have had the least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

Lisbon (LIS) was the most common stop: 27% of momondo users choosing 1-stop flights on this route connected there.

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $446.

Flights connecting via Amsterdam (AMS) have the shortest average one-way travel time: 13h 33m.

Amsterdam (AMS) has the shortest average layover time for this route: 1h 10m.

As of May 2026, there are 3 flights per day flying from San Francisco to Barcelona-El Prat Airport. The most common time of day flights depart is 5:00PM, with 100% of flights taking off in the afternoon.

21 flights are operational weekly from San Francisco to Barcelona-El Prat Airport as of May 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.