Flight Changi Airport departs from Singapore Changi Airport at 22:00 and arrives at Guangzhou Guangzhou Baiyun International Airport at 02:15.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 1282 Km. So the average speed is roughly 302 Km.
The best day to arrive at Singapore is Thursday and it would be best to avoid Saturday, as prices are on average 2280.57% higher than on Thursday. (Average prices, based on 310251 datapoints.)
We have a lot more statistics for flights TR 106 and between Singapore and Guangzhou.