CZ 3520 then 3U 1065 at Guangzhou
Qingdao → Guangzhou → Xi'an
Timetable, Guangzhou time
16:00CZ 3520 from Qingdao at the gate
20:153U 1065 to Xi'an leaves the gate
4 h 15 apart on the timetable
The last days
CZ 3520 and 3U 1065 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.