How long is the flight from london to san francisco?

The flight time from London (LHR) to San Francisco (SFO) is approximately 10 hours 30 minutes for a direct flight. However, actual flight times may vary depending on factors such as weather conditions, air traffic, and the specific route taken by the airline. It is always best to check with the airline or refer to the flight schedule for the most up-to-date and accurate flight times.