Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 01:20 and arrives at Singapore Changi Airport at 05:40.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 1282 Km. So the average speed is roughly 296 Km.
The best day to arrive at Guangzhou is Friday and it would be best to avoid Wednesday, as prices are on average 201.5% higher than on Friday. (Average prices, based on 152631 datapoints.)
We have a lot more statistics for flights SQ 853 and between Guangzhou and Singapore.
