Cheap flights from London Heathrow Airport to San Diego from £420

If you don’t want to visit San Diego in February, then you should wait until January to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £558.

The cheapest day to depart from London Heathrow Airport to San Diego is on a Tuesday when prices can be found for as low as £694. Flights from London Heathrow Airport to San Diego on a Sunday will generally be more expensive and average around £820. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

In the morning is the cheapest time of day to fly from London Heathrow Airport to San Diego when you can find flight prices for as low as £734. Flying to San Diego in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at midday because they tend to be around £801. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to San Diego from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around £745 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from London Heathrow Airport for as low as £670 on momondo.

There are 4 cabin classes available to choose from on London Heathrow Airport to San Diego 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 14% on your flight if you consider stops on a London Heathrow Airport to San Diego flight.

As of October 2026, prices for London Heathrow Airport to San Diego flights are approximately 12% cheaper when compared to flights at the same time last year.

United Airlines, JetBlue, and British Airways are the most popular carriers operating from London Heathrow to San Diego

British Airways, United Airlines and Virgin Atlantic are the top three most popular airlines that fly to San Diego from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 67% of people opting to fly with this airline when travelling to San Diego. Keep in mind that there are 11 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between London and San Diego have experienced a delay on any given week. The average delay length over the past 12 months has been 142 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon 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. Saturday 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 16% of their flights experiencing any sort of delay.

Phoenix (PHX) was the most common stop: 29% of momondo users choosing one-stop flights on this route connected there.

Flights via Houston (IAH) offer the lowest average return price of £429.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 13h 40m.

Seattle (SEA) has the shortest average stopover time for this route: 1h 34m.

The number of flights available between London Heathrow Airport and San Diego is 2 per day as of October 2026. The most frequent departure time is 11:00, with 54% of daily flights leaving in the afternoon.

19 flights are operational weekly from London Heathrow Airport to San Diego as of October 2026. The most popular departure day for this route is Wed, with 32% of flights per week taking off on this day.