Flight Beijing Capital International Airport departs from Beijing Beijing Capital International Airport at 21:20 and arrives at Chengdu Chengdu Shuangliu International Airport at 00:25.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1449 Km. So the average speed is roughly 355 Km.
There is an 1 hour time difference between Beijing and Chengdu