Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 21:45 and arrives at Seoul Incheon International Airport at 07:05.
The flighttime is about 7h 20m. The distance travelled ("as the bird flies"): 2960 Km. So the average speed is roughly 404 Km.
There is an 2 hour time difference between Jakarta and Seoul
The best day to arrive at Jakarta is Tuesday and it would be best to avoid Wednesday, as prices are on average 35.44% higher than on Tuesday. (Average prices, based on 3670433 datapoints.)
We have a lot more statistics for flights TG 628 and between Jakarta and Seoul.