Cheap flights from Portugal to San Francisco from $426

If you aren’t able to travel to San Francisco during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $784.

The cheapest day to depart from Portugal to San Francisco is on a Thursday when prices can be found for as low as $842. The most expensive day to fly to San Francisco is Monday, with ticket prices averaging around $1,885.

Our data shows that the cheapest Portugal to San Francisco flights are usually those with departure times in the morning. Our users have found flights to San Francisco in the morning for as low as $933. Flights at noon are often more expensive with an average ticket price of $1,134.

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

You are more likely to see cheaper flights to San Francisco from Portugal when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $902 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Portugal for as low as $727 on momondo.

There are 3 cabin classes available to choose from on Portugal to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

British Airways and KLM are the most popular carriers operating from Portugal to San Francisco

TAP AIR PORTUGAL, United Airlines and Delta are the top three most popular airlines that fly to San Francisco from Portugal according to our data. TAP AIR PORTUGAL is the first choice among our users, with 59% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 4 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

Historically, on average around 18% of flights between Portugal and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 107 minutes.

Generally, flights departing in the morning 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, 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.

The number of flights available between Portugal and San Francisco is 3 per week as of September 2026. The most frequent departure day is Mon, with 67% of weekly flights leaving on this day.

Flight times from Portugal to San Francisco vary, but if you’re flying out of Lisbon and flying into San Francisco (one of the most popular routes), then the duration is 12h 35m on average. Another popular route from Portugal to San Francisco is flying from Porto to San Francisco, which will take roughly 17h 58m. Keep in mind that layovers or delays could extend your travel time.