Flight Narita International Airport departs from Tokyo Narita International Airport at 20:40 and arrives at Seoul Incheon International Airport at 23:10.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 1555 Km. So the average speed is roughly 622 Km.
The best day to arrive at Tokyo is Wednesday and it would be best to avoid Friday, as prices are on average 213.84% higher than on Wednesday. (Average prices, based on 3797931 datapoints.)
We have a lot more statistics for flights RS 704 and between Tokyo and Seoul.
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