Flight Daxing International Airport departs from Beijing Daxing International Airport at 15:40 and arrives at Chongqing Chongqing Jiangbei International Airport at 18:30.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 1154 Km. So the average speed is roughly 301 Km.
There is an 1 hour time difference between Beijing and Chongqing