Flight Haneda Airport departs from Tokyo Haneda Airport at 16:10 and arrives at Seoul Gimpo International Airport at 18:35.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 1450 Km. So the average speed is roughly 600 Km.
The best day to arrive at Tokyo is Monday and it would be best to avoid Friday, as prices are on average 149.62% higher than on Monday. (Average prices, based on 645006 datapoints.)
We have a lot more statistics for flights NH 865 and between Tokyo and Seoul.
