Cheap flights from San Francisco to London from $336

The month of February is, on average, the cheapest month to fly to London Heathrow Airport from San Francisco, with most prices found around $649. If you’re not able to fly to London Heathrow Airport in February, then January is your next best option. Flight prices from San Francisco to London Heathrow Airport during January average around $696.

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $912. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,047.

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 $904. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $1,003.

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 $869 when searching weeks out. 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 $805 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 August 2026, prices for San Francisco to London Heathrow Airport flights are approximately 38% cheaper when compared to flights at the same time last year.

JetBlue and ITA Airways are the most popular carriers operating from San Francisco to London Heathrow

United Airlines, British Airways and Virgin Atlantic are the top three most popular airlines that fly to London Heathrow Airport from San Francisco according to our data. United Airlines is the first choice among our users, with 40% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 21 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 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 151 minutes.

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

Monday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 8% of their flights experiencing any sort of delay.

Dublin (DUB) was the most common stop: 28% of momondo users choosing 1-stop flights on this route connected there.

Flights via Lisbon (LIS) offer the lowest average round-trip price of $588.

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 13h 37m.

Frankfurt am Main (FRA) has the shortest average layover time for this route: 1h 28m.

The number of flights available between San Francisco and London Heathrow Airport is 38 per day as of August 2026. The most frequent departure time is 4:00PM, with 66% of daily flights leaving in the afternoon.

As of August 2026, 266 flights take off from San Francisco and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.