Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 05:30 and arrives at Batam Hang Nadim Airport at 07:10.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 354 Km. So the average speed is roughly 212 Km.
The best day to arrive at Jakarta is Thursday and it would be best to avoid Friday, as prices are on average 63.16% higher than on Thursday. (Average prices, based on 310252713 datapoints.)
We have a lot more statistics for flights IU 2850 and between Jakarta and Batam.
