Flight Haneda Airport departs from Tokyo Haneda Airport at 12:15 and arrives at Taipei Taipei Songshan Airport at 15:05.
The flighttime is about 11h 50m. The distance travelled ("as the bird flies"): 2157 Km. So the average speed is roughly 182 Km.
There is an 9 hour time difference between Tokyo and Taipei
The best day to arrive at Tokyo is Saturday and it would be best to avoid Tuesday, as prices are on average 93.6% higher than on Saturday. (Average prices, based on 9485598 datapoints.)
We have a lot more statistics for flights GA 191 and between Tokyo and Taipei.