Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 23:30 and arrives at Seoul Gimpo International Airport at 08:30.
The flighttime is about 7h 00m. The distance travelled ("as the bird flies"): 2997 Km. So the average speed is roughly 428 Km.
There is an 2 hour time difference between Jakarta and Seoul
The best day to arrive at Jakarta is Sunday and it would be best to avoid Tuesday, as prices are on average 46.05% higher than on Sunday. (Average prices, based on 23273804 datapoints.)
We have a lot more statistics for flights GA 878 and between Jakarta and Seoul.
