Flight Changi Airport departs from Singapore Changi Airport at 07:30 and arrives at Hong Kong Hong Kong International Airport at 11:20.
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 day to arrive at Singapore is Monday and it would be best to avoid Saturday, as prices are on average 165.62% higher than on Monday. (Average prices, based on 3894358 datapoints.)
We have a lot more statistics for flights SQ 874 and between Singapore and Hong Kong.
