Flight Narita International Airport departs from Tokyo Narita International Airport at 20:30 and arrives at Seoul Incheon International Airport at 23:25.
The flighttime is about 2h 55m. The distance travelled ("as the bird flies"): 1555 Km. So the average speed is roughly 533 Km.
The best day to arrive at Tokyo is Tuesday and it would be best to avoid Friday, as prices are on average 167.3% higher than on Tuesday. (Average prices, based on 4215692 datapoints.)
We have a lot more statistics for flights OZ 109 and between Tokyo and Seoul.
