Flight Haneda Airport departs from Tokyo Haneda Airport at 19:45 and arrives at Seoul Incheon International Airport at 22:20.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 1487 Km. So the average speed is roughly 576 Km.
The best day to arrive at Tokyo is Monday and it would be best to avoid Sunday, as prices are on average 33.84% higher than on Monday. (Average prices, based on 1485946 datapoints.)
We have a lot more statistics for flights KE 5712 and between Tokyo and Seoul.
