Flight Gimpo International Airport departs from Seoul Gimpo International Airport at 20:20 and arrives at Taipei Taoyuan International Airport at 21:55.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 989 Km. So the average speed is roughly 383 Km.
There is an 1 hour time difference between Seoul and Taipei
The best day to arrive at Seoul is Sunday and it would be best to avoid Tuesday, as prices are on average 387.75% higher than on Sunday. (Average prices, based on 468130 datapoints.)
We have a lot more statistics for flights BR 155 and between Seoul and Taipei.