Ottawa to London Time Difference
London is 5 hours ahead of Ottawa. When it is noon in Ottawa, it is 17:00 in London.
Toronto (UTC-4) → London (UTC+1)
🕐 Interactive Time Explorer
When it's 12:00 in Ottawa, it's 17:00 in London
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Ottawa & London✓ Perfect Match (3 hours)
◐ Extended Hours (7 hours)
✈️ Travel Information
Distance
5,361 km
Est. Flight Time
~7.3h
Time Difference
+5h
Work Hours Overlap
3h
Limited
🔴 Office Closed
Today 09:00
09:00 - 12:00
⏰ Quick Conversion
06:00
Ottawa
11:00
London
09:00
Ottawa
14:00
London
12:00
Ottawa
17:00
London
15:00
Ottawa
20:00
London
18:00
Ottawa
23:00
London
21:00
Ottawa
02:00
London (+1)
00:00
Ottawa
05:00
London
03:00
Ottawa
08:00
London
Frequently Asked Questions
How many hours is Ottawa behind London?
London is 5 hours ahead of Ottawa. When it is 12:00 noon in Ottawa, it is 17:00 in London. Ottawa operates on America/Toronto (UTC-4), while London uses Europe/London (UTC+1).
What is the best time to call London from Ottawa?
There are 3 hours of overlapping business time (9 AM–5 PM) between Ottawa and London. The best window is 09:00–12:00 Ottawa time (14:00–17:00 in London).
Does the Ottawa 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 Ottawa and London
The distance between Ottawa and London is approximately 5,361 km. A direct flight typically takes around 7.3 hours. Your arrival clock will show local London time — use our Flight Time Calculator to predict exact arrival times.