Vietnam Airlines from Singapore to Osaka has 3 flights every day. And there are 21 flights per week flying out of Singapore which connect to Osaka.
The price for economy class – one way ticket of Vietnam Airlines from Singapore to Osaka is 34.754.000 VND (or ~$1736 USD) and the price for bussiness class – one way ticket of Vietnam Airline is 49.282.000 VND (or ~$2462 USD).