CA 818 then CA 1231 at Beijing
Washington → Beijing → Xi'an
Timetable, Beijing time
03:55CA 818 from Washington at the gate
06:45CA 1231 to Xi'an leaves the gate
2 h 50 apart on the timetable
The last days
CA 818 and CA 1231 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.