Route 113 begins at an intersection with I-95 (Exit 30) at the Bridgeport-Stratford town line and heads east into Stratford as Lordship Boulevard.

It then heads southeast along the western boundary of Sikorsky Memorial Airport, then turns east, still encircling the airport, along Oak Bluff Avenue and Prospect Drive.

The transition between Oak Bluff Avenue and Prospect Drive is a roundabout intersection.

Continuing north, it goes under I-95 without an interchange past the Stratford railroad station, intersecting with U.S. Route 1, then running for another 1.6 miles (2.6 km) in the residential part of town before ending at Route 110 (East Main Street).

In 1952, it was extended north to the Shelton town center via the Huntington Turnpike.