Flight Fukuoka Airport departs from Fukuoka Fukuoka Airport at 16:00 and arrives at Hong Kong Hong Kong International Airport at 18:35.
The flighttime is about 3h 35m. The distance travelled ("as the bird flies"): 1948 Km. So the average speed is roughly 544 Km.
There is an 1 hour time difference between Fukuoka and Hong Kong