Please be aware that Taipei has multiple airports and that these results are only for Taipei Songshan Airport.
The best month to arrive at Taipei is May and the most expensive month to fly is March. (Average prices, based on 200 datapoints.)
The cheapest airline flying to Taipei is XiamenAir. They are 88% cheaper than All Nippon Airways. (Average prices, based on 213 datapoints.)
At Taipei the most flights depart around 19:00. (Hourly flights, based on 255 datapoints.)