Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 11:00 and arrives at Taipei Taoyuan International Airport at 15:40.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 2312 Km. So the average speed is roughly 631 Km.
There is an 1 hour time difference between Bangkok and Taipei