Flight Haneda Airport departs from Tokyo Haneda Airport at 06:35 and arrives at Hong Kong Hong Kong International Airport at 10:15.
The flighttime is about 4h 40m. The distance travelled ("as the bird flies"): 2992 Km. So the average speed is roughly 641 Km.
There is an 1 hour time difference between Tokyo and Hong Kong
The best day to arrive at Tokyo is Friday and it would be best to avoid Saturday, as prices are on average 700.81% higher than on Friday. (Average prices, based on 1104243 datapoints.)
We have a lot more statistics for flights UO 625 and between Tokyo and Hong Kong.