United States
United Kingdom
San Francisco to London Time Difference
London is 8 hours ahead of San Francisco
San Francisco vs London — At a Glance
San Francisco to London — Hour-by-Hour
About San Francisco and London
San Francisco (population: 0.87M) is known for Silicon Valley, the Golden Gate Bridge, venture capital, and the global tech industry. London (population: 8.8M) is known for global finance, the City of London, Buckingham Palace, and the world's oldest underground railway.
Business Hours Overlap
With a 8-hour difference, teams in San Francisco and London typically rely on a narrow overlap window for real-time meetings and use async tools like Slack or email for the rest.
Calling Between Cities
When calling London (+44) from San Francisco (+1), be mindful of the 8-hour gap. The safest window is early morning in San Francisco (8–10 AM) to reach people during waking hours.
Currency
San Francisco uses USD while London uses GBP. Check current exchange rates before making payments or transferring funds between the two cities.
Language
San Francisco and London share English as a common language, which simplifies business communication.
Use our world clock tool to compare San Francisco and London visually, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between San Francisco and London?
London, United Kingdom is 8 hours ahead of San Francisco, United States. San Francisco is in the America/Los Angeles timezone (UTC-7) and London is in the Europe/London timezone (UTC+1).
When it's noon in San Francisco, what time is it in London?
When it's 12:00 PM (noon) in San Francisco, it's 8:00 PM in London.
What is the best time to call London from San Francisco?
The best time to call London from San Francisco is during the overlapping business hours. When it's 9 AM in San Francisco, it's 5:00 PM in London. Aim for late morning to early afternoon in San Francisco for the best chance of reaching someone during working hours.
What currency does London use?
London, United Kingdom uses GBP. San Francisco uses USD. You will need to check the current exchange rate for transactions between the two.
What language is spoken in London?
The primary language in London is English. San Francisco also speaks English, making communication easier.
How do I dial London from San Francisco?
To call London from San Francisco, dial your international access code followed by +44 and the local number. San Francisco uses country code +1 and London uses +44.
