Vietnam Airlines from Beijing to Bangkok has 1 flight every day. And there are 4 flights per week flying out of Beijing which connect to Bangkok.
The price for economy class – one way ticket of Vietnam Airlines from Beijing to Bangkok is 9.629.000 VND (or ~$479 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 17.215.000 VND (or ~$859 USD).