Flight Haneda Airport departs from Tokyo Haneda Airport at 19:40 and arrives at Seoul Incheon International Airport at 22:00.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 1487 Km. So the average speed is roughly 637 Km.
The best day to arrive at Tokyo is Friday and it would be best to avoid Sunday, as prices are on average 91.95% higher than on Friday. (Average prices, based on 1301467 datapoints.)
We have a lot more statistics for flights KE 5712 and between Tokyo and Seoul.
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