Vietnam Airlines from Sydney to Vientiane has 1 flight every day. And there are 3 flights per week flying out of Sydney which connect to Vientiane.
The price for economy class – one way ticket of Vietnam Airlines from Sydney to Vientiane is 15.513.000 VND (or ~$774 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 32.088.000 VND (or ~$1602 USD).