A3 953 then BA 633 at Athens
Riyadh → Athens → London Heathrow
Timetable, Athens time
07:40A3 953 from Riyadh at the gate
16:25BA 633 to London Heathrow leaves the gate
8 h 45 apart on the timetable
The last days
A3 953 and BA 633 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.