Trenton-Mercer Airport (TTN) is a small airport in Ewing Township, Mercer County, owned by the county. It offers limited scheduled passenger service — often from a single low-cost airline — plus busy general aviation and corporate jet traffic. For travelers in Princeton, Trenton, the Hopewell Valley and Bucks County, Pennsylvania, TTN can be far more convenient than Newark or Philadelphia when it serves the route you need.

At a glance
Location Ewing Township, Mercer County, NJ
Owner Mercer County
Service Limited scheduled flights; significant private aviation
Nearby Princeton, Trenton, Lawrenceville, Bucks County
Alternatives Newark (EWR), Philadelphia (PHL)

Pros

  • Very short drive for central New Jersey.
  • Small terminal with quick security.
  • Easy parking and pickups.

Cons

  • Few routes and airlines, subject to change.
  • Limited backup options if a flight is cancelled.

Newark or Philadelphia instead?

From Princeton, Newark is often about 45–60 minutes away and offers far more flights, including international. Philadelphia is a similar distance for southern Mercer County. Read Newark vs JFK vs LaGuardia from Central Jersey and Newark Airport to Princeton.

Private aviation

Trenton-Mercer is also used by business jets serving the Princeton area. Read what is an FBO and private aviation transfers.

Tips for flying from TTN

  • Check the schedule carefully. Small airports may have only a few departures a week on some routes, and schedules change seasonally.
  • Arrive a little early anyway. Security lanes are few, so a single busy flight can create a short queue.
  • Have a backup plan. If your flight is cancelled, rebooking may mean waiting a day or switching to Newark or Philadelphia — a pre-arranged car service can help re-route you.
  • Plan your onward ride. Taxi and ride-hail availability can be limited at small airports, especially late at night; booking ahead avoids waiting.

A short history

Trenton-Mercer grew from an early airfield used in the 1920s and 1930s. During the Second World War it was associated with aircraft production nearby, and today it serves both scheduled flights and a large volume of private and corporate aviation for the Princeton-Trenton corridor.