Cheap flights from London to San Diego from $538

If you are unable to visit San Diego during the month of February, then departing from London during the month October is also very affordable. Most momondo users find prices during this month for around $479.

The cheapest day to depart from London to San Diego is on a Monday. Travelers who choose to depart for San Diego on a Monday will often find tickets for as low as $786. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,049. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

The cheapest time of day to fly to San Diego is at noon when flights can be purchased for as low as $839. Flights in the morning are often more expensive with an average ticket price of $918.

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

You are more likely to see cheaper flights to San Diego from London when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $845 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from London for as low as $730 on momondo.

You could potentially save up to 2% on your flight if you consider stops on a London to San Diego flight.

As of April 2026, prices for London to San Diego flights are approximately 6% cheaper when compared to flights at the same time last year.

SWISS, Lufthansa, and United Airlines are the most popular carriers operating from London to San Diego

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to San Diego from London according to our data. British Airways is the first choice among our users, with 60% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 3 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 151 minutes.

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

Tuesday 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 16% of their flights experiencing any sort of delay.

The number of flights available between London and San Diego is 7 per day as of April 2026. The most frequent departure time is 11:00AM, with 53% of daily flights leaving at noon.

As of April 2026, 51 flights take off from London and land in San Diego each week. The most common flight departure day for this route is Mon, with 18% of weekly flights taking off on this day.