Flight Deals from San Diego to London Heathrow Airport from $331

Flights from San Diego to London are most expensive in late June and least expensive in late January.

When planning your flights from San Diego to London, be aware that prices tend to vary significantly throughout the year. The peak price season occurs in late June, where flights can be quite expensive, occasionally reaching their highest around that time. Notable high prices can also be seen in mid-March and mid-December. Conversely, the least expensive time to fly is typically in late January, after which prices gradually rise until mid-March. Keep an eye out for abrupt transitions into high prices in June and again in mid-December, while low prices generally reappear in late September.

Book flights from San Diego to London 55-83 days in advance for the best prices; avoid booking within 50 days to prevent higher costs.

To achieve the best rates for flights from San Diego to London, aim to book your tickets between 55 and 83 days before departure. Prices are most affordable around 61 days before your trip, reaching approximately $833. Be cautious, as booking earlier may lead to costs up to $1,012, which is significantly higher. While the price remains relatively stable from 83 to 55 days before departure, waiting until 50 days can expose you to volatile pricing and decreased seat availability. If your departure is within 50 days, prioritize booking immediately because prices rise steadily, peaking at about $1,126 close to departure, reflecting a 32% increase.