London is 8 hours ahead of San Francisco. London uses GMT/BST while San Francisco uses Pacific Time (PT). Both cities observe DST, so the 8-hour difference remains consistent year-round.
When it's 12:00 PM in San Francisco, it's 8:00 PM in London.
Morning SF, late afternoon London! 8:00 AM in San Francisco is 4:00 PM in London - the best overlap for business.
San Francisco is the heart of Silicon Valley's tech industry, with many UK companies having offices there. Direct flights between London and San Francisco take approximately 10-11 hours.