Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 08:35 and arrives at Chitose New Chitose Airport at 13:30.
The flighttime is about 3h 55m. The distance travelled ("as the bird flies"): 2602 Km. So the average speed is roughly 664 Km.
There is an 1 hour time difference between Taipei and Chitose