London to Kolkata Time Difference
Kolkata is 4 hours 30 min ahead of London. When it is noon in London, it is 16.5:00 in Kolkata.
London (UTC+1) → Kolkata (UTC+5:30)
🕐 Interactive Time Explorer
When it's 20:00 in London, it's 0.5:00 in Kolkata
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
London & Kolkata✓ Perfect Match (4 hours)
◐ Extended Hours (6 hours)
✈️ Travel Information
Distance
7,962 km
Est. Flight Time
~10.4h
Time Difference
+4.5h
Work Hours Overlap
4h
Good
🔴 Office Closed
Tomorrow 09:00
09:00 - 13:00
⏰ Quick Conversion
06:00
London
10.5:00
Kolkata
09:00
London
13.5:00
Kolkata
12:00
London
16.5:00
Kolkata
15:00
London
19.5:00
Kolkata
18:00
London
22.5:00
Kolkata
21:00
London
1.5:00
Kolkata (+1)
00:00
London
4.5:00
Kolkata
03:00
London
7.5:00
Kolkata
Frequently Asked Questions
How many hours is London behind Kolkata?
Kolkata is 4 hours 30 min ahead of London. When it is 12:00 noon in London, it is 16.5:00 in Kolkata. London operates on Europe/London (UTC+1), while Kolkata uses Asia/Kolkata (UTC+5.5).
What is the best time to call Kolkata from London?
There are 4 hours of overlapping business time (9 AM–5 PM) between London and Kolkata. The best window is 09:00–13:00 London time (13.5:00–17.5:00 in Kolkata).
Does the London to Kolkata 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 Kolkata
The distance between London and Kolkata is approximately 7,962 km. A direct flight typically takes around 10.4 hours. Your arrival clock will show local Kolkata time — use our Flight Time Calculator to predict exact arrival times.