Air Italy/Meridiana has some good prices available for travel from New York City to Naples with a stop in Milan each way. There’s availability in September and October of 2018.
If you want to squeeze in a quick visit to Milan there’s also an option for a longer layover. You can book directly on the Air Italy website, but hurry because there’s not many seats left.
A good price for travel to Italy. A carry-on and a checked luggage is also included in the price of the ticket. Naples is on of my favorite cities to visit. You can check out some of my pictures from last summer.