Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 22:20 and arrives at Singapore Changi Airport at 02:15.
The flighttime is about 3h 55m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 338 Km.
The best day to arrive at Hong Kong is Tuesday and it would be best to avoid Wednesday, as prices are on average 247% higher than on Tuesday. (Average prices, based on 2865984 datapoints.)
We have a lot more statistics for flights TR 977 and between Hong Kong and Singapore.
