Flight Kagoshima Airport departs from Kagoshima Kagoshima Airport at 12:40 and arrives at Hong Kong Hong Kong International Airport at 15:00.
The flighttime is about 3h 20m. The distance travelled ("as the bird flies"): 1947 Km. So the average speed is roughly 584 Km.
There is an 1 hour time difference between Kagoshima and Hong Kong