Flight Narita International Airport departs from Tokyo Narita International Airport at 11:45 and arrives at Taipei Taoyuan International Airport at 14:30.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 2260 Km. So the average speed is roughly 603 Km.
There is an 1 hour time difference between Tokyo and Taipei
The best day to arrive at Tokyo is Saturday and it would be best to avoid Thursday, as prices are on average 850.6% higher than on Saturday. (Average prices, based on 2123775 datapoints.)
We have a lot more statistics for flights JL 8663 and between Tokyo and Taipei.
THB