Booking with British Airways 50 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to San Francisco. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, the most affordable month to book a British Airways flight from London Heathrow Airport to San Francisco in September, with an average price of £360. Conversely, traveling with British Airways from London Heathrow Airport to San Francisco in July will be the most expensive, with an average cost of £426. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.
If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).
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