Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 22:10 and arrives at Phnom Penh Phnom Penh International Airport at 00:10.
The flighttime is about 3h 00m. The distance travelled ("as the bird flies"): 1030 Km. So the average speed is roughly 343 Km.
There is an 1 hour time difference between Guangzhou and Phnom Penh