Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 11:50 and arrives at Singapore Changi Airport at 15:40.
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 month to arrive at Hong Kong is November and the most expensive month to fly is December. (Average prices, based on 869 datapoints.)
We have a lot more statistics for flights CX 791 and between Hong Kong and Singapore.
