Flight Incheon International Airport departs from Seoul Incheon International Airport at 15:05 and arrives at Jakarta Soekarno–Hatta International Airport at 20:05.
The flighttime is about 7h 00m. The distance travelled ("as the bird flies"): 2960 Km. So the average speed is roughly 423 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 February. (Average prices, based on 284 datapoints.)
The best day to arrive at Seoul is Friday and it would be best to avoid Saturday, as prices are on average 210.1% higher than on Friday. (Average prices, based on 9521634 datapoints.)
We have a lot more statistics for flights NH 627 and between Seoul and Jakarta.