Cheap flights from San Francisco to the United Kingdom from £250

The cheapest month to fly to United Kingdom from San Francisco is in February. Flight prices, which tend to average around £501, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom 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 £534.

The cheapest day to depart from San Francisco to United Kingdom is on a Wednesday. Travellers who choose to depart for United Kingdom on a Wednesday will often find tickets for as low as £615. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to United Kingdom for around £894.

The cheapest time of day to fly to United Kingdom is in the morning when flights can be purchased for as low as £592. Try not to purchase tickets at midday because they tend to be around £892. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from San Francisco to London Heathrow for the best San Francisco - United Kingdom flight prices

You are more likely to see cheaper flights to United Kingdom from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £693 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from San Francisco for as low as £662 on momondo.

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

Delta, British Airways, and SWISS are the most popular carriers operating from San Francisco to United Kingdom

Virgin Atlantic, British Airways and United Airlines are the top three most popular airlines that fly to United Kingdom from San Francisco according to our data. Virgin Atlantic is the first choice among our users, with 45% of people opting to fly with this airline when travelling to United Kingdom. Keep in mind that there are 7 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between San Francisco and United Kingdom have experienced a delay on any given week. The average delay length over the past 12 months has been 152 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the morning have, in the past, seen delays more frequently in comparison.

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

According to our data, British Airways have had the fewest delays on this route over the last 12 months, with about 9% of their flights experiencing any sort of delay.

37 flights are operational daily from San Francisco to United Kingdom as of October 2026. The most popular departure time for this route is 16:00, with 67% of flights per day taking off in the afternoon.

The number of flights available between San Francisco and United Kingdom is 261 per week as of October 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.