Philadelphia International Airport (PHI) – Harrah’s is about 67 miles from Philadelphia which will take an hour to drive. Train takes an hour from Philadelphia to Atlantic City. Greyhound buses take an hour and half.
Mercer County Airport in Trenton/Princeton (TTN) – Frontier Airlines offers round trip tickets below $100 to/from many destinations. Airline charges for luggage. Book early. Airport is easy to get in and out of with barely no line for security. Rental car can be booked from the airport to the hotel. Atlantic City is 95 miles from TTN which will take 1 and ½ hour drive from TTN.