Please be aware that Taipei has multiple airports and that these results are for all airports serving the city.
The best month to fly between Taipei and Hong Kong is March and the most expensive month to fly is August. (Average prices, based on 4021 datapoints.)
The best day to arrive at Taipei is Tuesday and it would be best to avoid Friday, as prices are on average 89.47% higher than on Tuesday. (Average prices, based on 795 datapoints.)
The cheapest airline flying from Taipei to Hong Kong is China Airlines. They are 34% cheaper than EVA Air. (Average prices, based on 4045 datapoints.)
The best time to fly is at around 20. (Average prices, based on 4501 datapoints.)