CZ 6781 then ZH 3307 at Guangzhou
Sanya → Guangzhou → Seoul
Timetable, Guangzhou time
09:40CZ 6781 from Sanya at the gate
12:20ZH 3307 to Seoul leaves the gate
2 h 40 apart on the timetable
The last days
CZ 6781 and ZH 3307 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.