There are regular flights to Naples from Liverpool and many other UK airports. Budget airlines make it an easy and affordable flight of about 3 hours. Currently flights are priced at about £70 each way.
Naples airport is just under an hour from Sorrento, passing close to Pompei and travelling past Mount Vesuvius.
We found a great transfer company who will pick you up from arrivals and whisk you door to door in air conditioned, German manufactured, automotive comfort for about 90 Euro for up to 8 people