Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 14:30 and arrives at Hong Kong Hong Kong International Airport at 16:30.
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 Saturday and it would be best to avoid Monday, as prices are on average 47.77% higher than on Saturday. (Average prices, based on 4165638 datapoints.)
We have a lot more statistics for flights CI 915 and between Taipei and Hong Kong.