OS 820 then BA 697 at Vienna
Heraklion → Vienna → London Heathrow
Timetable, Vienna time
10:50OS 820 from Heraklion at the gate
17:05BA 697 to London Heathrow leaves the gate
6 h 15 apart on the timetable
The last days
OS 820 and BA 697 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.