Cheapest flight from Siem Reap/Phenom Penh to Macau/HK?

Sorry cannot type Chinese here. Now I am in Siem Reap, I want to go back to Guangzhou from Macau or HK airport in early Oct(say around 10 Oct)

Can anyone suggest if there is any cheap flight from Siem Reap to Macau/HK? If not having in Siem Reap, Phenom Penh is ok.

I have searched in Dragon Fly, it is about 180USD, seems a little high.