Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 12:40 and arrives at Wuhan Wuhan Tianhe International Airport at 18:00.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 1586 Km. So the average speed is roughly 366 Km.
There is an 1 hour time difference between Bangkok and Wuhan