Flight Kansai International Airport departs from Osaka Kansai International Airport at 19:00 and arrives at Seoul Incheon International Airport at 21:00.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 1002 Km. So the average speed is roughly 501 Km.
The best day to arrive at Osaka is Monday and it would be best to avoid Sunday, as prices are on average 139.64% higher than on Monday. (Average prices, based on 5287790 datapoints.)
We have a lot more statistics for flights RS 716 and between Osaka and Seoul.
PHP
