BA 1292 then KL 1008 at Heathrow
Washington → London → Amsterdam
Timetable, London time
10:00BA 1292 from Washington at the gate
14:05KL 1008 to Amsterdam leaves the gate
4 h 05 apart on the timetable
The last days
BA 1292 and KL 1008 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.