London is currently 8 hours ahead of Seattle. Convert time between London and Seattle, see the exact difference, and find the best hours for calls and meetings.
London uses British Summer Time. Seattle uses Pacific Daylight Time. London time is 8 hours ahead of Seattle. So, when it is 12:00 AM in London, it is 4:00 PM in Seattle.
Common London times and their Seattle equivalents.
| London Time | Seattle Time |
|---|---|
| 12:00 AM London | 4:00 PM Seattle |
| 1:00 AM London | 5:00 PM Seattle |
| 2:00 AM London | 6:00 PM Seattle |
| 3:00 AM London | 7:00 PM Seattle |
| 4:00 AM London | 8:00 PM Seattle |
| 5:00 AM London | 9:00 PM Seattle |
| 6:00 AM London | 10:00 PM Seattle |
| 7:00 AM London | 11:00 PM Seattle |
| 8:00 AM London | 12:00 AM Seattle |
| 9:00 AM London | 1:00 AM Seattle |
| 10:00 AM London | 2:00 AM Seattle |
| 11:00 AM London | 3:00 AM Seattle |
| 12:00 PM London | 4:00 AM Seattle |
| 1:00 PM London | 5:00 AM Seattle |
| 2:00 PM London | 6:00 AM Seattle |
| 3:00 PM London | 7:00 AM Seattle |
| 4:00 PM London | 8:00 AM Seattle |
| 5:00 PM London | 9:00 AM Seattle |
| 6:00 PM London | 10:00 AM Seattle |
| 7:00 PM London | 11:00 AM Seattle |
| 8:00 PM London | 12:00 PM Seattle |
| 9:00 PM London | 1:00 PM Seattle |
| 10:00 PM London | 2:00 PM Seattle |
| 11:00 PM London | 3:00 PM Seattle |
London uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) in summer. The UK clocks go forward one hour on the last Sunday of March and back on the last Sunday of October. GMT takes its name from the Royal Observatory in Greenwich, east London — the historical origin of UTC-based world time.
Los Angeles and the US West Coast use Pacific Time — Pacific Standard Time (PST, UTC−8) in winter and Pacific Daylight Time (PDT, UTC−7) in summer. The transition follows the same US schedule: forward in March, back in November. Silicon Valley operates in this timezone, making PT a reference point for the tech industry.
Both London and Seattle may observe Daylight Saving Time, which means the offset between them can change twice a year. Here is what to expect each season.
| Period | Note | London | Seattle | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | GMT (UTC+0) | PST (UTC−8) | 8 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | GMT (UTC+0) | PDT (UTC−7) | 7 hours |
| Late Mar – Oct current | Both on summer / daylight time | GMT+1 (UTC+1) | PDT (UTC−7) | 8 hours |
| Late Oct – early Nov | Clocks transitioning — check exact date | GMT (UTC+0) | PST (UTC−8) | 8 hours |
The transition window typically lasts 1–2 weeks in spring and autumn. If you have a recurring weekly meeting near a clock change, verify the exact date to avoid a missed call.
London is currently 8 hours ahead of Seattle. London uses British Summer Time (UTC+1) and Seattle uses Pacific Daylight Time (UTC−7).
The best overlap window is 5:00 pm–6:00 pm London time, which corresponds to 9:00 am–10:00 am Seattle time. Both cities are within standard business hours (9 am–6 pm) during this window.
When it is 9:00 AM in London, it is 1:00 am in Seattle. London is 8 hours ahead of Seattle.
When it is 5:00 PM in Seattle, it is 1:00 am in London (next day).
Both London and Seattle observe Daylight Saving Time, but their transitions may not happen on the same date. During the brief 1–2 week windows in spring and autumn when only one zone has changed clocks, the offset between the two cities shifts by one hour. For most of the year the difference is 8 hours, but double-check the transition dates if you have a recurring meeting scheduled near those windows.