Flight Pudong International Airport departs from Shanghai Pudong International Airport at 21:20 and arrives at Hong Kong Hong Kong International Airport at 00:15.
The flighttime is about 2h 55m. The distance travelled ("as the bird flies"): 988 Km. So the average speed is roughly 339 Km.
The best day to arrive at Shanghai is Saturday and it would be best to avoid Sunday, as prices are on average 39.23% higher than on Saturday. (Average prices, based on 2790849 datapoints.)
We have a lot more statistics for flights CX 5809 and between Shanghai and Hong Kong.