Flight Narita International Airport departs from Tokyo Narita International Airport at 11:10 and arrives at Seoul Incheon International Airport at 13:40.
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 Monday and it would be best to avoid Sunday, as prices are on average 147.05% higher than on Monday. (Average prices, based on 3797917 datapoints.)
We have a lot more statistics for flights LJ 204 and between Tokyo and Seoul.
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