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