Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 15:45 and arrives at Hong Kong Hong Kong International Airport at 17:40.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 826 Km. So the average speed is roughly 431 Km.
The best day to arrive at Taipei is Monday and it would be best to avoid Friday, as prices are on average 352.35% higher than on Monday. (Average prices, based on 3430010 datapoints.)
We have a lot more statistics for flights HX 255 and between Taipei and Hong Kong.