Flight Haneda Airport departs from Tokyo Haneda Airport at 10:50 and arrives at Taipei Taipei Songshan Airport at 13:30.
The flighttime is about 11h 40m. The distance travelled ("as the bird flies"): 2157 Km. So the average speed is roughly 185 Km.
There is an 9 hour time difference between Tokyo and Taipei
The best day to arrive at Tokyo is Thursday and it would be best to avoid Sunday, as prices are on average 13.76% higher than on Thursday. (Average prices, based on 9766705 datapoints.)
We have a lot more statistics for flights GA 189 and between Tokyo and Taipei.