AC 178 then AC 406 at Toronto Pearson
Edmonton → Toronto → Montréal
Timetable, Toronto time
06:08AC 178 from Edmonton at the gate
10:00AC 406 to Montréal leaves the gate
3 h 52 apart on the timetable
The last days
AC 178 and AC 406 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.