Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 09:05 and arrives at Singapore Changi Airport at 12:55.
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 Thursday and it would be best to avoid Sunday, as prices are on average 167.7% higher than on Thursday. (Average prices, based on 3660533 datapoints.)
We have a lot more statistics for flights SQ 899 and between Hong Kong and Singapore.
