Cheap flights from San Francisco to London from £309

In general, February is the cheapest month to fly from San Francisco to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £484. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from San Francisco averaging around £513.

On average, the least expensive day to fly to London Heathrow Airport from San Francisco is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £554. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Tuesday is £737.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from San Francisco to London Heathrow Airport in the morning for as low as £554. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are £881 on average. Flights to London Heathrow Airport from San Francisco at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £618 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from San Francisco for as low as £565 on momondo.

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

No. A direct flight is the cheapest option for a flight between San Francisco to London Heathrow Airport.

As of July 2026, prices for San Francisco to London Heathrow Airport flights are approximately 59% cheaper when compared to flights at the same time last year.

United Airlines and Delta are the most popular carriers operating from San Francisco to London Heathrow

Virgin Atlantic, United Airlines and British Airways are the top three most popular airlines that fly to London Heathrow Airport from San Francisco according to our data. Virgin Atlantic is the first choice among our users, with 44% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 6 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% 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 153 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 8% of their flights experiencing any sort of delay.

The number of flights available between San Francisco and London Heathrow Airport is 41 per day as of July 2026. The most frequent departure time is 16:00, with 59% of daily flights leaving in the afternoon.

As of July 2026, there are 290 flights per week flying from San Francisco to London Heathrow Airport. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.