KL 794 then KL 1007 at Schiphol
São Paulo → Amsterdam → London Heathrow
Timetable, Amsterdam time
05:25KL 794 from São Paulo at the gate
11:45KL 1007 to London Heathrow leaves the gate
6 h 20 apart on the timetable
The last days
KL 794 and KL 1007 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.