Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 21:10 and arrives at Singapore Changi Airport at 01:00.
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 Friday and it would be best to avoid Saturday, as prices are on average 45.86% higher than on Friday. (Average prices, based on 2064405 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 124 datapoints.)
We have a lot more statistics for flights TR 981 and between Hong Kong and Singapore.