Flight Haneda Airport departs from Tokyo Haneda Airport at 23:55 and arrives at Hong Kong Hong Kong International Airport at 04:15.
The flighttime is about 5h 20m. The distance travelled ("as the bird flies"): 2992 Km. So the average speed is roughly 561 Km.
There is an 1 hour time difference between Tokyo and Hong Kong
The best day to arrive at Tokyo is Monday and it would be best to avoid Tuesday, as prices are on average 323.64% higher than on Monday. (Average prices, based on 1384935 datapoints.)
We have a lot more statistics for flights CX 5623 and between Tokyo and Hong Kong.