London to Sydney Time Difference
Sydney is 9 hours ahead of London. When it is noon in London, it is 21:00 in Sydney.
London (UTC+1) → Sydney (UTC+10)
London (GMT/BST) and Sydney (AEST/AEDT) sit 9–11 hours apart depending on each city's DST cycle. The gap is smallest when both cities are near summer simultaneously and largest when seasons diverge. Business-hour overlap is minimal — the ASX typically closes before the LSE opens each day.
🕐 Interactive Time Explorer
When it's 03:00 in London, it's 12:00 in Sydney
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
London & Sydney◐ Extended Hours (5 hours)
✈️ Travel Information
Distance
16,994 km
Est. Flight Time
~21h
Time Difference
+9h
Work Hours Overlap
0h
None
🔴 Office Closed
No overlap available
No overlap
⏰ Quick Conversion
06:00
London
15:00
Sydney
09:00
London
18:00
Sydney
12:00
London
21:00
Sydney
15:00
London
00:00
Sydney (+1)
18:00
London
03:00
Sydney (+1)
21:00
London
06:00
Sydney (+1)
00:00
London
09:00
Sydney
03:00
London
12:00
Sydney
Frequently Asked Questions
How many hours is London behind Sydney?
Sydney is 9 hours ahead of London. When it is 12:00 noon in London, it is 21:00 in Sydney. London operates on Europe/London (UTC+1), while Sydney uses Australia/Sydney (UTC+10).
What is the best time to call Sydney from London?
Standard business hours (9 AM–5 PM) do not overlap between London and Sydney due to the 9 hours difference. Consider early morning or late evening calls, or use async communication.
Does the London to Sydney 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 Sydney
The distance between London and Sydney is approximately 16,994 km. A direct flight typically takes around 21 hours. Your arrival clock will show local Sydney time — use our Flight Time Calculator to predict exact arrival times.