You can leave the highway and follow the "tangenziale" (bypass) road towards Pozzuoli till the junction of Via Campania. Then you follow the road markings to the harbour of Pozzuoli.

Arriving at the Capodichino airport take a taxi or bus to Molo Beverello (ships and hydrofoils) or the harbour of Mergellina (hydrofoils). A shuffle service is available from the airport to Molo Beverello.

Take a taxi, tram or bus to Molo Beverello (2 km from the train station).

Caremar
Hydrofoil and ferryboat from naples and just ferryboat from Pozzuoli harbor.
Alilauro
Just hydrofoils from Naples.
Medmar
Just ferryboat fronm Naples and Pozzuoli harbors.
Snav
Just hydrofoils from Naples.