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 day to arrive at Hong Kong is Thursday and it would be best to avoid Sunday, as prices are on average 172.25% higher than on Thursday. (Average prices, based on 2830208 datapoints.)
We have a lot more statistics for flights SQ 875 and between Hong Kong and Singapore.
