Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 22:10 and arrives at Hanoi Noi Bai International Airport at 23:15.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 837 Km. So the average speed is roughly 402 Km.
There is an 1 hour time difference between Guangzhou and Hanoi