Kolkata to London Time Difference
London is 4 hours 30 min behind Kolkata. When it is noon in Kolkata, it is 7.5:00 in London.
Kolkata (UTC+5:30) → London (UTC+1)
🕐 Interactive Time Explorer
When it's 20:00 in Kolkata, it's 15.5:00 in London
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Kolkata & London✓ Perfect Match (3 hours)
◐ Extended Hours (7 hours)
✈️ Travel Information
Distance
7,962 km
Est. Flight Time
~10.4h
Time Difference
-4.5h
Work Hours Overlap
3h
Limited
🔴 Office Closed
Today 14:00
14:00 - 17:00
⏰ Quick Conversion
06:00
Kolkata
1.5:00
London
09:00
Kolkata
4.5:00
London
12:00
Kolkata
7.5:00
London
15:00
Kolkata
10.5:00
London
18:00
Kolkata
13.5:00
London
21:00
Kolkata
16.5:00
London
00:00
Kolkata
19.5:00
London (-1)
03:00
Kolkata
22.5:00
London (-1)
Frequently Asked Questions
How many hours is Kolkata ahead of London?
London is 4 hours 30 min behind Kolkata. When it is 12:00 noon in Kolkata, it is 7.5:00 in London. Kolkata operates on Asia/Kolkata (UTC+5.5), while London uses Europe/London (UTC+1).
What is the best time to call London from Kolkata?
There are 4 hours of overlapping business time (9 AM–5 PM) between Kolkata and London. The best window is 14:00–18:00 Kolkata time (9.5:00–13.5:00 in London).
Does the Kolkata to London 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 Kolkata and London
The distance between Kolkata and London is approximately 7,962 km. A direct flight typically takes around 10.4 hours. Your arrival clock will show local London time — use our Flight Time Calculator to predict exact arrival times.