A semiconductor package is disclosed. The semiconductor package includes a back-side wiring substrate and a front-side redistribution layer which are in parallel, and a connector, a semiconductor chip and an encapsulator which are between the back-side wiring substrate and the front-side redistribution layer. The encapsulator surrounds surfaces of the connector and the semiconductor chip. The back-side wiring substrate includes a core layer, a back-side via plug extending through the core layer, and a back-side redistribution layer on the back-side via plug.