BA 357 then BA 772 at Heathrow
Lyon → London → Oslo
Timetable, London time
10:30BA 357 from Lyon at the gate
14:20BA 772 to Oslo leaves the gate
3 h 50 apart on the timetable
The last days
BA 357 and BA 772 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.