Cheap flights from San Diego to London from £316

In general, September is the cheapest month to fly from San Diego to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £551. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from San Diego averaging around £551.

On average, the least expensive day to fly to London Heathrow Airport from San Diego is on a Monday. momondo users have found tickets for Monday departures for as low as £519. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £919.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from San Diego to London Heathrow Airport in the evening for as low as £700. 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 in the afternoon when prices are £726 on average. Flights to London Heathrow Airport from San Diego in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £688 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 Diego for as low as £555 on momondo.

There are 3 cabin classes available to choose from on San Diego to London Heathrow 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 6% on your flight if you consider stops on a San Diego to London Heathrow Airport flight.

As of April 2026, prices for San Diego to London Heathrow Airport flights are approximately 8% cheaper when compared to flights at the same time last year.

Dallas (DFW) was the most common stop: 50% of momondo users choosing one-stop flights on this route connected there.

Flights via New York (JFK) offer the lowest average return price of £667.

Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 14h 16m.

Dallas (DFW) has the shortest average stopover time for this route: 2h 11m.

As of April 2026, there are 6 flights per day flying from San Diego to London Heathrow Airport. The most common time of day flights depart is 19:00, with 100% of flights taking off in the evening.

As of April 2026, 42 flights take off from San Diego 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.