Flight Changi Airport departs from Singapore Changi Airport at 15:00 and arrives at Palembang Sultan Mahmud Badaruddin II International Airport at 15:20.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 141 Km. So the average speed is roughly 106 Km.
There is an 1 hour time difference between Singapore and Palembang