Flight Changi Airport departs from Singapore Changi Airport at 09:50 and arrives at Hong Kong Hong Kong International Airport at 13:55.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 324 Km.
The best month to arrive at Singapore is December and the most expensive month to fly is August. (Average prices, based on 1253 datapoints.)
We have a lot more statistics for flights AC 5888 and between Singapore and Hong Kong.
