Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 10:10 and arrives at Chitose New Chitose Airport at 15:00.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 2602 Km. So the average speed is roughly 679 Km.
There is an 1 hour time difference between Taipei and Chitose