If you take the subway there will be an additional5 charge for the airtrain to get from the subway to the airport.
Another option would to take the PATH to 33rd St. Walk over to Penn Station...take the Long Island RailRoad (LIRR) to the Jamaica Station (price can range from3-7.) then take the airtrain to the airport. This will take a little less time (and will be more comfortable) than the subway.
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