Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 07:35 and arrives at Palembang Sultan Mahmud Badaruddin II International Airport at 08:45.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 238 Km. So the average speed is roughly 204 Km.
The best month to arrive at Jakarta is February and the most expensive month to fly is December. (Average prices, based on 649 datapoints.)
We have a lot more statistics for flights SQ 102 and between Jakarta and Palembang.