Seoul is currently 8 hours ahead of London. Convert time between Seoul and London, see the exact difference, and find the best hours for calls and meetings.
Seoul uses Korean Standard Time. London uses British Summer Time. Seoul time is 8 hours ahead of London. So, when it is 12:00 AM in Seoul, it is 4:00 PM in London.
Common Seoul times and their London equivalents.
| Seoul Time | London Time |
|---|---|
| 12:00 AM Seoul | 4:00 PM London |
| 1:00 AM Seoul | 5:00 PM London |
| 2:00 AM Seoul | 6:00 PM London |
| 3:00 AM Seoul | 7:00 PM London |
| 4:00 AM Seoul | 8:00 PM London |
| 5:00 AM Seoul | 9:00 PM London |
| 6:00 AM Seoul | 10:00 PM London |
| 7:00 AM Seoul | 11:00 PM London |
| 8:00 AM Seoul | 12:00 AM London |
| 9:00 AM Seoul | 1:00 AM London |
| 10:00 AM Seoul | 2:00 AM London |
| 11:00 AM Seoul | 3:00 AM London |
| 12:00 PM Seoul | 4:00 AM London |
| 1:00 PM Seoul | 5:00 AM London |
| 2:00 PM Seoul | 6:00 AM London |
| 3:00 PM Seoul | 7:00 AM London |
| 4:00 PM Seoul | 8:00 AM London |
| 5:00 PM Seoul | 9:00 AM London |
| 6:00 PM Seoul | 10:00 AM London |
| 7:00 PM Seoul | 11:00 AM London |
| 8:00 PM Seoul | 12:00 PM London |
| 9:00 PM Seoul | 1:00 PM London |
| 10:00 PM Seoul | 2:00 PM London |
| 11:00 PM Seoul | 3:00 PM London |
Seoul uses Korea Standard Time (KST, UTC+9) year-round, identical to Tokyo in offset. South Korea does not observe Daylight Saving Time. The consistent UTC+9 offset means Seoul–Tokyo scheduling has zero drift throughout the year.
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.
Both Seoul and London 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 | Seoul | London | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | GMT+9 (UTC+9) | GMT (UTC+0) | 9 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | GMT+9 (UTC+9) | GMT (UTC+0) | 9 hours |
| Late Mar – Oct current | Both on summer / daylight time | GMT+9 (UTC+9) | GMT+1 (UTC+1) | 8 hours |
| Late Oct – early Nov | Clocks transitioning — check exact date | GMT+9 (UTC+9) | GMT (UTC+0) | 9 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.
Seoul is currently 8 hours ahead of London. Seoul uses Korean Standard Time (UTC+9) and London uses British Summer Time (UTC+1).
The best overlap window is 5:00 pm–6:00 pm Seoul time, which corresponds to 9:00 am–10:00 am London time. Both cities are within standard business hours (9 am–6 pm) during this window.
When it is 9:00 AM in Seoul, it is 1:00 am in London. Seoul is 8 hours ahead of London.
When it is 5:00 PM in London, it is 1:00 am in Seoul (next day).
London observes Daylight Saving Time but Seoul does not. This means the offset between the two cities changes by one hour when London transitions its clocks. Always verify the current offset when scheduling meetings near DST transition dates.