Flight Daxing International Airport departs from Beijing Daxing International Airport at 18:15 and arrives at Chongqing Chongqing Jiangbei International Airport at 21:00.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1154 Km. So the average speed is roughly 308 Km.
There is an 1 hour time difference between Beijing and Chongqing