Flight Narita International Airport departs from Tokyo Narita International Airport at 09:15 and arrives at Seoul Incheon International Airport at 12:00.
The flighttime is about 2h 45m. The distance travelled ("as the bird flies"): 1555 Km. So the average speed is roughly 565 Km.
The best day to arrive at Tokyo is Saturday and it would be best to avoid Thursday, as prices are on average 97.97% higher than on Saturday. (Average prices, based on 4214516 datapoints.)
We have a lot more statistics for flights KE 706 and between Tokyo and Seoul.
