The cheapest way is to take the subway. You can also take a cab or an airport shuttle like Super Shuttle (1-800-BLUE-VAN).
First, take the shuttle (called the AirTrain) from inside the JFK terminals, to the Howard Beach Station of the A train (of the A-C-E, the blue line). Then take the Manhattan-bound A train to 34th Street-Penn Station.
From JFK you can take the air-tram to the Howard Beach/JFK airport stop on the A subway line. That is an express train that goes to 34th street-penn station. Getting off at this stop puts you directly in Penn Station, all you have to do is follow the signs. If you are coming from Penn Station going to JFK airport, make sure to get a on JFK/Far Rockaway bound A train, there are 3 different A trains.
To travel from Newark Airport to Newark Penn Station, you can take the AirTrain from the airport to the Newark Liberty International Airport Station, and then transfer to a NJ Transit train to Newark Penn Station. The journey takes about 20-30 minutes.
Penn Station.
No, there is currently no direct train service available from LaGuardia Airport to Penn Station.
To travel from LaGuardia Airport to Penn Station using the train, you can take the Q70-SBS bus from the airport to the Jackson Heights-Roosevelt Avenue subway station. From there, you can transfer to the E train, which will take you directly to Penn Station.
To travel from LaGuardia Airport to Penn Station using the subway, you can take the M60 bus from the airport to the Astoria Blvd subway station. From there, you can transfer to the N or W train and take it to 34th Street-Herald Square station, which is near Penn Station.
At JFK, you can get a shuttle (called the AirTrain) from inside the JFK terminals to the Howard Beach Station of the A train (on the A-C-E, which is the blue line). The A will take you to Penn Station (34th Street). From Penn Station, you can take the LIRR (Long Island Railroad) to either East Hampton, Westhampton, or Southampton. I have included a link to the LIRR home page where you can get the schedules.
It will take an estimated 16 minutes to get from Penn Station, New York to LGA airport. There are 9.43 miles between the two places.
From the Newark airport, take the Northeastern Regional train to New York Penn Station. From Penn Station, there are 8 trains a day to Albany.
To travel from Newark Penn Station to LaGuardia Airport, you can take a combination of NJ Transit and the NYC Airporter bus. From Newark Penn Station, take NJ Transit to Port Authority Bus Terminal in Manhattan. Then transfer to the NYC Airporter bus, which will take you directly to LaGuardia Airport.
To efficiently navigate from LaGuardia Airport to Penn Station, you can take a taxi, ride-sharing service, or airport shuttle for a direct and convenient option. Alternatively, you can take the M60 bus to the Astoria Blvd subway station and transfer to the N or W train to reach Penn Station. This route may take longer but is a more cost-effective option.
To take the subway from LaGuardia to Penn Station, you will need to first take the Q70 bus from the airport to the Roosevelt Ave-Jackson Heights subway station. From there, you can transfer to the E train, which will take you directly to Penn Station.