Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 09:35 and arrives at Batam Hang Nadim Airport at 11:20.
The flighttime is about 1h 45m. The distance travelled ("as the bird flies"): 354 Km. So the average speed is roughly 202 Km.
The best month to arrive at Jakarta is May and the most expensive month to fly is December. (Average prices, based on 6306 datapoints.)
We have a lot more statistics for flights KE 5639 and between Jakarta and Batam.