Cheap flights from San Francisco to Portugal from $372

The cheapest month to fly to Portugal from San Francisco is in January. Flight prices, which tend to average around $409, 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 Portugal from San Francisco during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $451.

According to our data, Tuesday is the cheapest day to fly to Portugal from San Francisco. The lowest ticket price found for a Tuesday departure recently was $656. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Friday, with ticket prices averaging around $785.

Our most recent data shows that the best time of day to fly to Portugal is in the afternoon. Flights from San Francisco to Portugal during this time can be as low as $701. In the evening is when there is more demand to fly to Portugal, so prices are often more expensive at around $805 per ticket.

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

You are more likely to see cheaper flights to Portugal from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $845 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from San Francisco for as low as $756 on momondo.

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

WestJet, Lufthansa, and United Airlines are the most popular carriers operating from San Francisco to Portugal

TAP AIR PORTUGAL, United Airlines and British Airways are the top three most popular airlines that fly to Portugal from San Francisco according to our data. TAP AIR PORTUGAL is the first choice among our users, with 58% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 16 different airlines that fly to Portugal 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 Portugal have experienced a delay on any given week. The average delay length over the past 12 months has been 125 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.

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Saturday 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.

1 flights are operational daily from San Francisco to Portugal as of June 2026. The most popular departure time for this route is 7:00PM, with 100% of flights per day taking off in the evening.

8 flights are operational weekly from San Francisco to Portugal as of June 2026. The most popular departure day for this route is Mon, with 38% of flights per week taking off on this day.