Flight Narita International Airport departs from Tokyo Narita International Airport at 17:15 and arrives at Hong Kong Hong Kong International Airport at 21:05.
The flighttime is about 4h 50m. The distance travelled ("as the bird flies"): 3064 Km. So the average speed is roughly 634 Km.
There is an 1 hour time difference between Tokyo and Hong Kong
The best day to arrive at Tokyo is Thursday and it would be best to avoid Sunday, as prices are on average 83.98% higher than on Thursday. (Average prices, based on 14102055 datapoints.)
We have a lot more statistics for flights CX 521 and between Tokyo and Hong Kong.