What is the Time Difference Between Sydney and London?
Sydney and London sit at opposite ends of the day — the time difference is 10 to 11 hours, and because the hemispheres are flipped, their DST periods barely overlap. This makes scheduling tricky but predictable.
Time Zone Overview
Sydney (AEST/AEDT)
Sydney is AEST (UTC+10) in winter and AEDT (UTC+11) during Australian DST (first Sunday October to first Sunday April).
London (GMT/BST)
London is GMT (UTC+0) in winter, BST (UTC+1) during UK DST (last Sunday March to last Sunday October).
Time Difference
Australian winter / UK summer: Sydney is 9 hours ahead of London
Australian summer / UK winter: Sydney is 11 hours ahead of London
Both DST (approx Oct–Mar overlap): 10 hours
Conversion Examples
UK winter: 9:00 AM GMT → 8:00 PM AEDT (same day)
UK summer: 9:00 AM BST → 6:00 PM AEST (same day)
Quick Reference Table (Sydney AEST → London GMT)
| Sydney | London |
|---|---|
| 7:00 AM | 9:00 PM (prev day) |
| 12:00 PM | 2:00 AM |
| 5:00 PM | 7:00 AM |
| 8:00 PM | 10:00 AM |
| 11:00 PM | 1:00 PM |
Common Use Cases
- UK-Australia business and relocation
- Family calls across hemispheres
- Travel between London and Sydney
- Following Ashes / sports across time zones
Frequently Asked Questions
What is the Sydney–London time difference?
9 to 11 hours depending on season.
Why is it so variable?
DST runs opposite: Australia Oct–Apr, UK Mar–Oct.
If it's 5 PM in Sydney, what time is it in London?
7 AM GMT (Syd summer) or 6 AM BST (Syd winter AEDT).
Best overlap?
8-10 AM London = 7-9 PM Sydney (winter) or 5-7 PM (summer AEDT).
Is Sydney ahead or behind London?
Ahead — by nearly half a day.
Use our world clock and meeting planner to handle the seasonal shift.