Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 11:00 and arrives at Hong Kong Hong Kong International Airport at 13:05.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 826 Km. So the average speed is roughly 396 Km.
The best day to arrive at Taipei is Thursday and it would be best to avoid Sunday, as prices are on average 71.48% higher than on Thursday. (Average prices, based on 5063721 datapoints.)
We have a lot more statistics for flights CI 909 and between Taipei and Hong Kong.