BA 689 then BA 1490 at Heathrow
Santorini → London → Glasgow
Timetable, London time
15:30BA 689 from Santorini at the gate
17:55BA 1490 to Glasgow leaves the gate
2 h 25 apart on the timetable
The last days
BA 689 and BA 1490 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.