CZ 3065 then CA 136 at Incheon
Changsha → Seoul → Beijing Capital
Timetable, Seoul time
12:35CZ 3065 from Changsha at the gate
16:30CA 136 to Beijing Capital leaves the gate
3 h 55 apart on the timetable
The last days
CZ 3065 and CA 136 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.