BA 479 then BA 320 at Heathrow
Barcelona → London → Paris Charles de Gaulle
Timetable, London time
15:00BA 479 from Barcelona at the gate
19:00BA 320 to Paris Charles de Gaulle leaves the gate
4 h apart on the timetable
The last days
BA 479 and BA 320 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.