Flight Incheon International Airport departs from Seoul Incheon International Airport at 15:05 and arrives at Jakarta Soekarno–Hatta International Airport at 20:15.
The flighttime is about 7h 10m. The distance travelled ("as the bird flies"): 2960 Km. So the average speed is roughly 413 Km.
There is an 2 hour time difference between Seoul and Jakarta
The best month to arrive at Seoul is October and the most expensive month to fly is June. (Average prices, based on 224 datapoints.)
The best day to arrive at Seoul is Monday and it would be best to avoid Wednesday, as prices are on average 134.15% higher than on Monday. (Average prices, based on 10535243 datapoints.)
We have a lot more statistics for flights GA 9727 and between Seoul and Jakarta.