Flight Changi Airport departs from Singapore Changi Airport at 08:25 and arrives at Hong Kong Hong Kong International Airport at 12:25.
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 Singapore is Sunday and it would be best to avoid Wednesday, as prices are on average 125.81% higher than on Sunday. (Average prices, based on 3149085 datapoints.)
We have a lot more statistics for flights SQ 882 and between Singapore and Hong Kong.