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 483 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 China Airlines. They are 42% cheaper than All Nippon Airways. (Average prices, based on 494 datapoints.)
The best time to fly is at around 6. (Average prices, based on 776 datapoints.)