Flight Changi Airport departs from Singapore Changi Airport at 06:40 and arrives at Hong Kong Hong Kong International Airport at 10:30.
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 Singapore is Friday and it would be best to avoid Wednesday, as prices are on average 84.39% higher than on Friday. (Average prices, based on 3148058 datapoints.)
We have a lot more statistics for flights CX 692 and between Singapore and Hong Kong.