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There are 5 airports in Trenton. Mercer County Airport (TTN) is Trenton’s primary airport with at least domestic flights and international flights departing from its runways every week. As of today, airlines operate out of Mercer County Airport (TTN). Mercer County Airport (TTN) is 5 miles from Trenton and offers nonstop flights to cities. Trenton’s secondary airport Philadelphia Intl Airport (PHL) is 35 miles from Trenton and has airlines operating out of it and offers nonstop flights to cities with at least domestic flights and international flights departing each week.