Flight Changi Airport departs from Singapore Changi Airport at 22:10 and arrives at Shenzhen Shenzhen Bao'an International Airport at 02:20.
The flighttime is about 4h 10m. The distance travelled ("as the bird flies"): 1318 Km. So the average speed is roughly 316 Km.
The best month to arrive at Singapore is April and the most expensive month to fly is May. (Average prices, based on 217 datapoints.)
The best day to arrive at Singapore is Wednesday and it would be best to avoid Thursday, as prices are on average 141.07% higher than on Wednesday. (Average prices, based on 70062 datapoints.)
We have a lot more statistics for flights SQ 856 and between Singapore and Shenzhen.