London to Seattle Time Difference
Seattle is 8 hours behind London. When it is noon in London, it is 04:00 in Seattle.
London (UTC+1) → Los Angeles (UTC-7)
London (GMT/BST) is consistently 8 hours ahead of Seattle (PST/PDT, UTC−8/−7). Both the UK and the US Pacific Northwest observe DST, and their changeover dates are close enough that the gap stays at 8 hours for the vast majority of the year. Seattle's tech industry (Amazon, Boeing, Microsoft) and London's financial and tech sectors interact heavily across this 8-hour corridor.
🕐 Interactive Time Explorer
When it's 05:00 in London, it's 21:00 in Seattle
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
London & Seattle◐ Extended Hours (7 hours)
✈️ Travel Information
Distance
7,699 km
Est. Flight Time
~10.1h
Time Difference
-8h
Work Hours Overlap
0h
None
🔴 Office Closed
No overlap available
No overlap
⏰ Quick Conversion
06:00
London
22:00
Seattle (-1)
09:00
London
01:00
Seattle
12:00
London
04:00
Seattle
15:00
London
07:00
Seattle
18:00
London
10:00
Seattle
21:00
London
13:00
Seattle
00:00
London
16:00
Seattle (-1)
03:00
London
19:00
Seattle (-1)
Frequently Asked Questions
How many hours is London ahead of Seattle?
Seattle is 8 hours behind London. When it is 12:00 noon in London, it is 04:00 in Seattle. London operates on Europe/London (UTC+1), while Seattle uses America/Los Angeles (UTC-7).
What is the best time to call Seattle from London?
There is 1 hour of overlapping business time (9 AM–5 PM) between London and Seattle. The best window is 17:00–18:00 London time (09:00–10:00 in Seattle).
Does the London to Seattle time difference change throughout the year?
The time difference can shift by up to one hour when either city observes Daylight Saving Time (DST). DST transition dates differ between countries — typically March/April in the Northern Hemisphere and October in the Southern Hemisphere. Always verify the live difference above when scheduling important meetings near DST changeover dates.
Flying between London and Seattle
The distance between London and Seattle is approximately 7,699 km. A direct flight typically takes around 10.1 hours. Your arrival clock will show local Seattle time — use our Flight Time Calculator to predict exact arrival times.