Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 11:05 and arrives at Singapore Changi Airport at 15:10.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 324 Km.
The best day to arrive at Hong Kong is Thursday and it would be best to avoid Saturday, as prices are on average 24.64% higher than on Thursday. (Average prices, based on 1985137 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 208 datapoints.)
We have a lot more statistics for flights TR 981 and between Hong Kong and Singapore.