BA 492 then BA 558 at Heathrow
Gibraltar → London → Rome
Timetable, London time
08:10BA 492 from Gibraltar at the gate
14:50BA 558 to Rome leaves the gate
6 h 40 apart on the timetable
The last days
BA 492 and BA 558 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.