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 289 datapoints.)
The best day to arrive at Taipei is Sunday and it would be best to avoid Wednesday, as prices are on average 134.13% higher than on Sunday. (Average prices, based on 459 datapoints.)
The cheapest airline flying from Taipei to Tokyo is Peach Aviation. They are 65% cheaper than Japan Airlines. (Average prices, based on 308 datapoints.)
The best time to fly is at around 2. (Average prices, based on 578 datapoints.)