Cheap flights from San Francisco to Lisbon from $442

In general, February is the cheapest month to fly from San Francisco to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $610. If you are unable to visit Lisbon during the month of February, then departing from San Francisco during the month January is also very affordable. Most momondo users find prices during this month for around $617.

Our data shows that Tuesday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $643. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to Lisbon for around $798.

The cheapest time of day to fly to Lisbon is in the afternoon when flights can be purchased for as low as $696. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $802 on average. Flights to Lisbon from San Francisco in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from San Francisco to Lisbon Humberto Delgado for the best San Francisco - Lisbon Humberto Delgado flight prices

You are more likely to see cheaper flights to Lisbon from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Lisbon for around $803 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Lisbon from San Francisco for as low as $730 on momondo.

There are 3 cabin classes available to choose from on San Francisco to Lisbon Humberto Delgado 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 17% on your flight if you consider stops on a San Francisco to Lisbon flight.

As of March 2026, prices for San Francisco to Lisbon flights are approximately 23% cheaper when compared to flights at the same time last year.

LEVEL, SWISS, and Virgin Atlantic are the most popular carriers operating from San Francisco to Lisbon Humberto Delgado

TAP AIR PORTUGAL, United Airlines and Air Canada are the top three most popular airlines that fly to Lisbon from San Francisco according to our data. TAP AIR PORTUGAL is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Lisbon. Keep in mind that there are 15 different airlines that fly to Lisbon on a routine basis, so you have a few additional options to choose from.

Historically, on average around 18% of flights between San Francisco and Lisbon have experienced a delay on any given week. The average delay length over the past 12 months has been 114 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the evening 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, TAP AIR PORTUGAL have had the least number of delays on this route over the last 12 months; with about 18% of their flights experiencing any sort of delay.

London (LHR) was the most common stop: 23% of momondo users choosing 1-stop flights on this route connected there.

Flights via Zurich (ZRH) offer the lowest average round-trip price of $585.

Flights connecting via Philadelphia (PHL) have the shortest average one-way travel time: 13h 20m.

Philadelphia (PHL) has the shortest average layover time for this route: 1h 15m.