Flight Narita International Airport departs from Tokyo Narita International Airport at 19:40 and arrives at Taipei Taoyuan International Airport at 22:45.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 2260 Km. So the average speed is roughly 553 Km.
There is an 1 hour time difference between Tokyo and Taipei
The best day to arrive at Tokyo is Tuesday and it would be best to avoid Monday, as prices are on average 1516.48% higher than on Tuesday. (Average prices, based on 2211739 datapoints.)
We have a lot more statistics for flights JL 5049 and between Tokyo and Taipei.