Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 09:20 and arrives at Batam Hang Nadim Airport at 11:00.
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 month to arrive at Jakarta is March and the most expensive month to fly is July. (Average prices, based on 3055 datapoints.)
We have a lot more statistics for flights OD 850 and between Jakarta and Batam.