Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 12:30 and arrives at Singapore Changi Airport at 16:30.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 330 Km.
The best month to arrive at Hong Kong is February and the most expensive month to fly is July. (Average prices, based on 3841 datapoints.)
We have a lot more statistics for flights SQ 881 and between Hong Kong and Singapore.