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 488 datapoints.)
The best day to arrive at Taipei is Saturday and it would be best to avoid Wednesday, as prices are on average 252.72% higher than on Saturday. (Average prices, based on 491 datapoints.)
The cheapest airline flying from Taipei to Tokyo is Scoot-Tiger. They are 62% cheaper than Japan Airlines. (Average prices, based on 500 datapoints.)
The best time to fly is at around 6. (Average prices, based on 814 datapoints.)