Flight Pudong International Airport departs from Shanghai Pudong International Airport at 21:20 and arrives at Chongqing Chongqing Jiangbei International Airport at 00:05.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1687 Km. So the average speed is roughly 450 Km.
There is an 1 hour time difference between Shanghai and Chongqing