Flight Changi Airport departs from Singapore Changi Airport at 08:00 and arrives at Hong Kong Hong Kong International Airport at 11:55.
The flighttime is about 3h 55m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 338 Km.
The best day to arrive at Singapore is Monday and it would be best to avoid Tuesday, as prices are on average 467% higher than on Monday. (Average prices, based on 3147759 datapoints.)
We have a lot more statistics for flights AY 5832 and between Singapore and Hong Kong.