AC 888 then VS 147 at Heathrow
Ottawa → London → Toronto
Timetable, London time
09:20AC 888 from Ottawa at the gate
16:10VS 147 to Toronto leaves the gate
6 h 50 apart on the timetable
The last days
AC 888 and VS 147 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.