Flight Changi Airport departs from Singapore Changi Airport at 13:25 and arrives at Hong Kong Hong Kong International Airport at 20:15.The flight has a short stop at Bangkok.
The flighttime is about 6h 50m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 193 Km.
The best day to arrive at Singapore is Monday and it would be best to avoid Sunday, as prices are on average 57.56% higher than on Monday. (Average prices, based on 2233956 datapoints.)
We have a lot more statistics for flights CX 712 and between Singapore and Hong Kong.