CA 143 then KJ 198 at Incheon
Yanji → Seoul → Tokyo Narita
Timetable, Seoul time
13:10CA 143 from Yanji at the gate
16:12KJ 198 to Tokyo Narita leaves the gate
3 h 02 apart on the timetable
The last days
CA 143 and KJ 198 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.