Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 16:40 and arrives at Xi an Xi'an Xianyang International Airport at 21:35.
The flighttime is about 3h 55m. The distance travelled ("as the bird flies"): 1061 Km. So the average speed is roughly 271 Km.
There is an 1 hour time difference between Bangkok and Xi an