Flight Narita International Airport departs from Tokyo Narita International Airport at 15:00 and arrives at Seoul Incheon International Airport at 17:50.
The flighttime is about 2h 50m. The distance travelled ("as the bird flies"): 1555 Km. So the average speed is roughly 549 Km.
The best day to arrive at Tokyo is Thursday and it would be best to avoid Sunday, as prices are on average 304.08% higher than on Thursday. (Average prices, based on 3798013 datapoints.)
We have a lot more statistics for flights TW 214 and between Tokyo and Seoul.
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