Flight Haneda Airport departs from Tokyo Haneda Airport at 20:05 and arrives at Seoul Gimpo International Airport at 22:20.
The flighttime is about 2h 15m. The distance travelled ("as the bird flies"): 1450 Km. So the average speed is roughly 644 Km.
The best day to arrive at Tokyo is Tuesday and it would be best to avoid Friday, as prices are on average 193.54% higher than on Tuesday. (Average prices, based on 631958 datapoints.)
We have a lot more statistics for flights NH 867 and between Tokyo and Seoul.
