Flight Kansai International Airport departs from Osaka Kansai International Airport at 08:55 and arrives at Hong Kong Hong Kong International Airport at 12:10.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 2482 Km. So the average speed is roughly 584 Km.
There is an 1 hour time difference between Osaka and Hong Kong
The best day to arrive at Osaka is Friday and it would be best to avoid Thursday, as prices are on average 155.6% higher than on Friday. (Average prices, based on 2335117 datapoints.)
We have a lot more statistics for flights HX 603 and between Osaka and Hong Kong.