

Newark is in New Jersey, so there aren't NYC cabs there, only Newark and Elizabeth cabs, and many people prefer to take a car service. JFK has a flat fare to anywhere in Manhattan. If you plan to take a taxi, LGA is the cheapest taxi ride. LGA has the cheapest public transportation, but it's only by city bus, so it's less convenient. EWR has the more expensive rail transportation. If you want to take public transportation from the airport to your hotel, JFK has the cheapest rail transportation. The marginal differences if you're staying in Manhattan are:

If you're staying in New Jersey, stick with Newark. If you're going to try to save some money on accomodations, then if you're staying in Queens, stick with LGA or JFK. If you're staying in Manhattan it doesn't really matter, the differences are marginal.
