Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 08:45 and arrives at Kagoshima Kagoshima Airport at 12:55.
The flighttime is about 3h 10m. The distance travelled ("as the bird flies"): 1947 Km. So the average speed is roughly 615 Km.
There is an 1 hour time difference between Hong Kong and Kagoshima