BA 689 then SK 1516 at Heathrow
Santorini → London → Copenhagen
Timetable, London time
15:30BA 689 from Santorini at the gate
18:40SK 1516 to Copenhagen leaves the gate
3 h 10 apart on the timetable
The last days
BA 689 and SK 1516 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.