Toronto is typically 5 hours behind London. When it's 3:00 PM in London, it's 10:00 AM in Toronto. Both cities observe daylight saving time, but the switch dates differ slightly between Canada and UK.
During the brief periods when North America and UK change clocks on different weekends (usually in March and November), the difference can temporarily be 4 or 6 hours. For most of the year, it's a consistent 5-hour difference.
Optimal meeting window: 8:00 AM - 11:00 AM Toronto time (1:00 PM - 4:00 PM London). This catches afternoon business hours in London while being morning in Toronto.
Toronto's financial district has strong ties to London, making this a frequent business route.