Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 01:35 and arrives at Taipei Taipei Songshan Airport at 06:20.
The flighttime is about 11h 45m. The distance travelled ("as the bird flies"): 2347 Km. So the average speed is roughly 200 Km.
There is an 7 hour time difference between Bangkok and Taipei