Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 01:45 and arrives at Singapore Changi Airport at 05:30.
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 Hong Kong is Saturday and it would be best to avoid Sunday, as prices are on average 113.63% higher than on Saturday. (Average prices, based on 3624475 datapoints.)
We have a lot more statistics for flights CX 659 and between Hong Kong and Singapore.
