Please be aware that Taipei and Tokyo has multiple airports and that these results are for all airports serving the city.
The best month to fly between Taipei and Tokyo is February and the most expensive month to fly is January. (Average prices, based on 507 datapoints.)
The best day to arrive at Taipei is Saturday and it would be best to avoid Wednesday, as prices are on average 256.49% higher than on Saturday. (Average prices, based on 509 datapoints.)
The cheapest airline flying from Taipei to Tokyo is Peach Aviation. They are 72% cheaper than Air Japan. (Average prices, based on 522 datapoints.)
The best time to fly is at around 6. (Average prices, based on 797 datapoints.)