Taxi is flat rate $45+tolls+tip to anywhere in Manhattan. Cheapest is by Airtrain/subway ($7.25); take Airtrain from your terminal to Howard Beach Station, take Manhattan-bound A subway to 59th St., transfer to the uptown 1, 2 or 3 subway to 96th St. Walk south on Broadway to 94th St. and turn right.
Taxi is flat rate