Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 20:15 and arrives at Batam Hang Nadim Airport at 21:45.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 354 Km. So the average speed is roughly 236 Km.
The best day to arrive at Jakarta is Saturday and it would be best to avoid Wednesday, as prices are on average 14.14% higher than on Saturday. (Average prices, based on 142771424 datapoints.)
We have a lot more statistics for flights QG 9946 and between Jakarta and Batam.