Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 20:25 and arrives at Phuket Phuket International Airport at 23:15.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 1716 Km. So the average speed is roughly 448 Km.
There is an 1 hour time difference between Guangzhou and Phuket