B3 722 then NH 8544 at Bangkok
Kolkata → Bangkok → Tokyo Narita
Timetable, Bangkok time
22:25B3 722 from Kolkata at the gate
05:06NH 8544 to Tokyo Narita leaves the gate
6 h 41 apart on the timetable, overnight
The last days
B3 722 and NH 8544 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.