Cheap flights from San Francisco to London from $675

If you aren’t able to travel during the month of November, then book flights to London from San Francisco during February instead. Flights to London in February, while not as cheap as those in November, still average around $924.

Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as $1,035. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to London for around $1,343.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as $1,266. In contrast, the most expensive time of day to depart to London is in the evening when prices are around $1,423.

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

You are more likely to see cheaper flights to London from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $1,161 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from San Francisco for as low as $1,040 on momondo.

There are 3 cabin classes available to choose from on San Francisco to London 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 26% on your flight if you consider stops on a San Francisco to London flight.

As of June 2026, prices for San Francisco to London flights are approximately 15% more expensive when compared to flights at the same time last year.

Historically, on average around 11% of flights between San Francisco and London have experienced a delay on any given week. The average delay length over the past 12 months has been 159 minutes.

Generally, flights departing at night 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 8% of their flights experiencing any sort of delay.

The number of flights available between San Francisco and London is 38 per day as of June 2026. The most frequent departure time is 16:00, with 59% of daily flights leaving in the afternoon.

270 flights are operational weekly from San Francisco to London as of June 2026. The most popular departure day for this route is Thu, with 16% of flights per week taking off on this day.