http://www.mta.info/nyct/service/airport.htm
LAGUARDIA AIRPORT
M60 bus from Manhattan and Astoria
With the M60 bus, you can travel to all terminals at LaGuardia from the West Side, the East Side or Astoria (Queens). The M60 runs between 106 St and Broadway in Manhattan and LaGuardia Airport from approximately 5 am to 1 am, seven days a week. The M60 serves all airport terminals. Connections can be made with all north-south Manhattan subway lines or with the N and W trains at the Astoria Blvd station.
If you pay your fare with MetroCard, you can transfer free between the subway and the M60 bus. The M60 also makes convenient connections with MTA Metro-North Railroad at the 125 St station. Travel time between Broadway and 116 St and the Delta Terminal is approximately 40 minutes.
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KENNEDY AIRPORT
Via the Subway and AirTrain JFK
Howard Beach AirTrain station
The stops at Howard Beach every 5 to 10 minutes during rush hours and every 15 to 20 minutes evenings and weekends. AirTrain stops at Howard Beach every 4 to10 minutes.
Most subway lines connect to the . Just be sure you take the marked "Far Rockaway" or "Rockaway Park", NOT " Lefferts Boulevard". Its about a 12-minute ride from Howard Beach station to the airport. The AirTrain fare is $5 and is in addition to the subway fare. You can pay the AirTrain fare with a Pay-Per-Ride MetroCard.
Jamaica AirTrain station
trains all stop at the Sutphin Boulevard station in Jamaica where you connect to the AirTrain Jamaica station. trains run every 5 to 10 minutes during rush hours and 8 to 12 minutes evenings and weekends. AirTrain travels to the airport from Jamaica every 4 to 10 minutes. The AirTrain ride to the airport takes about 12 minutes. The AirTrain fare is $5 and is in addition to the subway fare. You can pay the AirTrain fare with a Pay-Per-Ride MetroCard.