ID 7147 then 8B 999 at Changi
Medan → Singapore → Jakarta
Timetable, Singapore time
13:00ID 7147 from Medan at the gate
15:308B 999 to Jakarta leaves the gate
2 h 30 apart on the timetable
The last days
ID 7147 and 8B 999 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.