CA 1274 then SC 7959 at Beijing
Lanzhou → Beijing → Kunming
Timetable, Beijing time
14:15CA 1274 from Lanzhou at the gate
18:35SC 7959 to Kunming leaves the gate
4 h 20 apart on the timetable
The last days
CA 1274 and SC 7959 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.