Flight Changi Airport departs from Singapore Changi Airport at 19:30 and arrives at Jakarta Soekarno–Hatta International Airport at 20:30.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 369 Km. So the average speed is roughly 184 Km.
There is an 1 hour time difference between Singapore and Jakarta
The best day to arrive at Singapore is Friday and it would be best to avoid Tuesday, as prices are on average 100.94% higher than on Friday. (Average prices, based on 290733469 datapoints.)
We have a lot more statistics for flights VN 837 and between Singapore and Jakarta.