Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 19:55 and arrives at Hong Kong Hong Kong International Airport at 21:55.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 826 Km. So the average speed is roughly 413 Km.
The best day to arrive at Taipei is Wednesday and it would be best to avoid Friday, as prices are on average 85.64% higher than on Wednesday. (Average prices, based on 3427198 datapoints.)
We have a lot more statistics for flights CX 531 and between Taipei and Hong Kong.