CZ 660 then 3U 1063 at Guangzhou
San Francisco → Guangzhou → Xi'an
Timetable, Guangzhou time
10:25CZ 660 from San Francisco at the gate
13:053U 1063 to Xi'an leaves the gate
2 h 40 apart on the timetable
The last days
CZ 660 and 3U 1063 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.