Flight Changi Airport departs from Singapore Changi Airport at 20:20 and arrives at Chongqing Chongqing Jiangbei International Airport at 01:15.
The flighttime is about 5h 55m. The distance travelled ("as the bird flies"): 873 Km. So the average speed is roughly 148 Km.
There is an 1 hour time difference between Singapore and Chongqing