I-91, Bradley is a bit closer than the New York airports and considerably more convenient to arrive at or depart from. There is no limo service to New Haven. Car rental is essential, but it is a very convenient airport to arrive at. It is 1 hours to New Haven. You may experience traffic delays because of construction along the major highway artery.
Public transportation is available directly into New York City by connecting bus and subway.
LaGuardia International Airport is served by all major carriers. It is approximately 2 hours from New Haven. Unfortunately, the airport is often subject to delays because of air traffic congestion. There is generally a transportation desk at all airports. Beware of any free-lance drivers offering you a ride.