QF 3271 then VS 148 at Toronto Pearson
Chicago O'Hare → Toronto → London Heathrow
Timetable, Toronto time
17:41QF 3271 from Chicago O'Hare at the gate
21:45VS 148 to London Heathrow leaves the gate
4 h 04 apart on the timetable
The last days
QF 3271 and VS 148 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.