Vietnam Airlines from Vientiane to Beijing has 2 flights every day. And there are 6 flights per week flying out of Vientiane which connect to Beijing.
The price for economy class – one way ticket of Vietnam Airlines from Vientiane to Beijing is 12.554.000 VND (or ~$626 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 22.616.000 VND (or ~$1129 USD).