Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 21:15 and arrives at Shanghai Pudong International Airport at 23:45.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 988 Km. So the average speed is roughly 395 Km.
The best day to arrive at Hong Kong is Friday and it would be best to avoid Monday, as prices are on average 154.48% higher than on Friday. (Average prices, based on 11344177 datapoints.)
We have a lot more statistics for flights KA 870 and between Hong Kong and Shanghai.