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 March. (Average prices, based on 268 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 483 datapoints.)
The cheapest airline flying from Taipei to Tokyo is Peach Aviation. They are 68% cheaper than Japan Airlines. (Average prices, based on 281 datapoints.)
The best time to fly is at around 20. (Average prices, based on 521 datapoints.)