Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 08:00 and arrives at Singapore Changi Airport at 11:50.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 345 Km.
The best day to arrive at Hong Kong is Wednesday and it would be best to avoid Friday, as prices are on average 81.29% higher than on Wednesday. (Average prices, based on 1988178 datapoints.)
We have a lot more statistics for flights SQ 897 and between Hong Kong and Singapore.