Airport: The most convenient airport to fly into for Princeton NJ is Newark Liberty International Airport in Newark NJ, http://www.panynj.gov/CommutingTravel/airports/html/newarkliberty.html.
One can also arrive at JFK International Airport http://www.jfk-airport.net/ or Philadelphia International Airport. These are further away.

Travel from Airport to Hotel: Refer to: http://princeton.hyatt.com/hyatt/hotels/services/transportation/index.jsp

a) You may rent a car or take a Limo or shuttle to the hotel from the airport. For people new to the area, please make prior arrangements or go to the Ground Transportation desk at the "Arrivals" level to arrange for a shuttle. Shuttle service cost is fixed and is approximately $23. Taxis are also available, but more expensive. Directions to the hotel are available at: http://princeton.hyatt.com/hyatt/hotels/services/maps/index.jsp

b) You may also take NJ Transit Commuter Rail (check times carefully) from Newark Airport to Princeton Junction. Check schedules (station to station) and fares at the NJ Transit web site: http://www.njtransit.com/sf_tr_schedules.shtml Obtain directions to take NJ Transit at the airport.

You will need to then either take the hotel shuttle or a cab (call upon arrival at Newark). Distance from Princeton Junction Station is 1 mile. Complimentary hotel shuttle: call the hotel at +1-609-987 1234 (BELL DESK) upon arrival and they will come and pick you up in the Hyatt Van. Check with hotel for times when shuttle is available.

c) Another option is travel by train: take Amtrak to Princeton Junction, and follow directions in 2(b) to get to the hotel from Princeton Junction.