Flight Changi Airport departs from Singapore Changi Airport at 13:25 and arrives at Hong Kong Hong Kong International Airport at 17:35.
The flighttime is about 4h 10m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 317 Km.
The best month to arrive at Singapore is May and the most expensive month to fly is August. (Average prices, based on 668 datapoints.)
We have a lot more statistics for flights CX 758 and between Singapore and Hong Kong.
