Vietnam Airlines from Singapore to Shanghai has 3 flights every day. And there are 21 flights per week flying out of Singapore which connect to Shanghai.
The price for economy class – one way ticket of Vietnam Airlines from Singapore to Shanghai 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).