Flight Taipei Songshan Airport departs from Taipei Taipei Songshan Airport at 15:35 and arrives at Tokyo Haneda Airport at 19:25.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 2157 Km. So the average speed is roughly 563 Km.
The best day to arrive at Taipei is Sunday and it would be best to avoid Friday, as prices are on average 120.87% higher than on Sunday. (Average prices, based on 1806105 datapoints.)
We have a lot more statistics for flights JL 98 and between Taipei and Tokyo.
