Vietnam Airlines from Ho Chi Minh City to Phnom Penh has 3 flights every day. And there are 21 flights per week flying out of Ho Chi Minh City which connect to Phnom Penh.
The price for economy class – one way ticket of Vietnam Airlines from Ho Chi Minh City to Phnom Penh is 4.393.000 VND (or ~$218 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 6.148.000 VND (or ~$305 USD).