Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 19:40 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 22:50.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 259 Km. So the average speed is roughly 120 Km.
There is an 1 hour time difference between Bangkok and Kuala Lumpur