Flight Changi Airport departs from Singapore Changi Airport at 19:50 and arrives at Guangzhou Guangzhou Baiyun International Airport at 00:15.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 1282 Km. So the average speed is roughly 290 Km.
The best day to arrive at Singapore is Sunday and it would be best to avoid Saturday, as prices are on average 1113.07% higher than on Sunday. (Average prices, based on 450570 datapoints.)
We have a lot more statistics for flights SQ 852 and between Singapore and Guangzhou.