Seoul to London time
Convert live between Seoul (KST) and London, with UK daylight saving applied for the exact date so your calls, meetings and match kick-offs land on the right hour.
Enter a valid date and time.
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How many hours is Seoul ahead of London?
Seoul stays on KST (UTC+9) all year and never observes daylight saving. London switches: it runs on GMT (UTC+0) in winter and British Summer Time, BST (UTC+1), in summer. That gives two gaps. Through the British winter, Seoul is 9 hours ahead of London; once the UK springs forward, Seoul is only 8 hours ahead. Because Korea never shifts its clocks, every change in the gap comes from Britain — forward on the last Sunday of March, back on the last Sunday of October.
Summer and winter, worked out
In summer (BST), subtract 8 hours from Seoul to get London. 9 AM in Seoul is 1 AM in London; the other way around, 9 AM in London is 5 PM in Seoul. In winter (GMT), subtract 9 hours instead: 9 AM in Seoul is midnight in London, and 9 AM in London is 6 PM in Seoul. Around the late-March and late-October switch dates the gap flips between 8 and 9 hours overnight, so the converter reads the real rule for the date you enter and adjusts on its own.
Calls, football and flights
For a video call with a UK team, their morning falls in your Seoul afternoon, which is easy to book. A Premier League 3 PM Saturday kick-off (BST) starts at 11 PM in Seoul; a winter GMT kick-off starts at midnight, so check before you settle in. Incheon–Heathrow flights cross an 8-9 hour gap, so the arrival clock time looks earlier than you'd expect. And when you call family or UK support, check their current time first so you don't ring in the middle of the night.
Frequently asked questions
What's the time difference between Seoul and London?
In the British summer (BST, late March to late October) Seoul is 8 hours ahead of London. In winter (GMT) Seoul is 9 hours ahead. Seoul stays fixed at UTC+9, so the entire change comes from the UK's daylight saving.
Why is it sometimes 8 hours and sometimes 9?
London moves its clocks forward an hour for British Summer Time (BST, UTC+1), while Seoul never uses daylight saving. When the UK springs forward the gap narrows from 9 hours to 8; when it falls back to GMT in late October, the gap returns to 9 hours.
Does it handle the daylight-saving switch dates correctly?
Yes. The tool works out London's actual offset (GMT or BST) from the date you enter, so the 8- or 9-hour gap is applied correctly even right around the late-March and late-October changeovers. Seoul always stays at UTC+9.