Flight Narita International Airport departs from Tokyo Narita International Airport at 18:30 and arrives at Seoul Incheon International Airport at 21:15.
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 Wednesday and it would be best to avoid Sunday, as prices are on average 130.9% higher than on Wednesday. (Average prices, based on 3826974 datapoints.)
We have a lot more statistics for flights ZE 604 and between Tokyo and Seoul.
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