Cheap flights from the United Kingdom to San Francisco from £255

The month of February is, on average, the cheapest month to fly to San Francisco from United Kingdom, with most prices found around £414. If you are unable to visit San Francisco during the month of February, then departing from United Kingdom during the month September is also very affordable. Most momondo users find prices during this month for around £422.

The cheapest day to depart on your flight to San Francisco is on a Thursday when prices can be found for as low as £558. This is often the case because there is less demand to fly during this day of the week. Flights from United Kingdom to San Francisco on a Sunday will generally be more expensive and average around £657. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to San Francisco is in the morning. Flights from United Kingdom to San Francisco during this time can be as low as £554. Try not to purchase tickets at midday because they tend to be around £814. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to San Francisco from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around £500 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from United Kingdom for as low as £466 on momondo.

There are 4 cabin classes available to choose from on United Kingdom to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

LEVEL, SWISS, and Aer Lingus are the most popular carriers operating from United Kingdom to San Francisco

British Airways, Virgin Atlantic and Lufthansa are the top three most popular airlines that fly to San Francisco from United Kingdom according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when travelling to San Francisco. Keep in mind that there are 19 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 11% of flights between United Kingdom and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 148 minutes.

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

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

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 10% of their flights experiencing any sort of delay.

As of February 2026, 31 flights take off from United Kingdom and land in San Francisco each day. The most common flight departure time for this route is 11:00, with 58% of daily flights taking off at midday.

217 flights are operational weekly from United Kingdom to San Francisco as of February 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.