UA 1802 then AC 1505 at Newark
Portland (Oregon) → New York → Toronto Pearson
Timetable, New York time
07:14UA 1802 from Portland (Oregon) at the gate
11:05AC 1505 to Toronto Pearson leaves the gate
3 h 51 apart on the timetable
The last days
UA 1802 and AC 1505 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.