Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 14:25 and arrives at Taiyuan Taiyuan Wusu Airport at 19:45.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 1501 Km. So the average speed is roughly 346 Km.
There is an 1 hour time difference between Bangkok and Taiyuan