Flight Changi Airport departs from Singapore Changi Airport at 01:25 and arrives at Hong Kong Hong Kong International Airport at 05:10.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 353 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Saturday, as prices are on average 53.15% higher than on Tuesday. (Average prices, based on 3148529 datapoints.)
We have a lot more statistics for flights CX 714 and between Singapore and Hong Kong.