YP 136 then TR 843 at Incheon
Washington → Seoul → Singapore
Timetable, Seoul time
05:25YP 136 from Washington at the gate
11:25TR 843 to Singapore leaves the gate
6 h apart on the timetable
The last days
YP 136 and TR 843 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.