Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 06:20 and arrives at Sibolga Ferdinand Lumban Tobing Airport at 08:30.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 825 Km. So the average speed is roughly 381 Km.
The best day to arrive at Jakarta is Friday and it would be best to avoid Sunday, as prices are on average 99.65% higher than on Friday. (Average prices, based on 26166 datapoints.)
We have a lot more statistics for flights GA 262 and between Jakarta and Sibolga.