Vietnam Airlines from Tokyo to Vientiane has 1 flight every day. And there are 7 flights per week flying out of Tokyo which connect to Vientiane.
The price for economy class – one way ticket of Vietnam Airlines from Tokyo to Vientiane is 34.590.000 VND (or ~$1728 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 49.118.000 VND (or ~$2454 USD).