Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 21:35 and arrives at Hong Kong Hong Kong International Airport at 23:15.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 826 Km. So the average speed is roughly 496 Km.
The best day to arrive at Taipei is Monday and it would be best to avoid Saturday, as prices are on average 253.12% higher than on Monday. (Average prices, based on 4236812 datapoints.)
We have a lot more statistics for flights HX 285 and between Taipei and Hong Kong.