Cheap flights from San Diego to London from £342

The cheapest month to fly to London from San Diego is in May. Flight prices, which tend to average around £77, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from San Diego averaging around £137.

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £664. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from San Diego to London for around £1,033.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £705. Flights in the evening are often more expensive, with an average ticket price of £756.

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

You are more likely to see cheaper flights to London from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £727 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 Diego for as low as £608 on momondo.

There are 3 cabin classes available to choose from on San Diego 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 46% on your flight if you consider stops on a San Diego to London flight.

As of June 2026, prices for San Diego to London flights are approximately 10% cheaper when compared to flights at the same time last year.

As of June 2026, there are 9 flights per day flying from San Diego to London. The most common time of day flights depart is 19:00, with 66% of flights taking off in the evening.

As of June 2026, 63 flights take off from San Diego and land in London each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.