Flight Narita International Airport departs from Tokyo Narita International Airport at 17:15 and arrives at Hong Kong Hong Kong International Airport at 21:20.
The flighttime is about 5h 05m. The distance travelled ("as the bird flies"): 3064 Km. So the average speed is roughly 603 Km.
There is an 1 hour time difference between Tokyo and Hong Kong
The best day to arrive at Tokyo is Tuesday and it would be best to avoid Wednesday, as prices are on average 76.77% higher than on Tuesday. (Average prices, based on 12947810 datapoints.)
We have a lot more statistics for flights CX 521 and between Tokyo and Hong Kong.