XC 9852 then TK 1931 at Istanbul
Sofia → Istanbul → London Heathrow
Timetable, Istanbul time
12:15XC 9852 from Sofia at the gate
13:35TK 1931 to London Heathrow leaves the gate
1 h 20 apart on the timetable
Istanbul’s board shows about 81% of departures at their timetable time, so delays of a few minutes don’t show here.
The last days
XC 9852 and TK 1931 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.