Route 114 was established as part of the 1932 state highway renumbering. It originally ran in a "C" pattern within the town of Woodbridge, connecting at both ends with Route 63 and serving Woodbridge center. The original route used modern Route 114 from its north end until the intersection with Route 243. Then it proceeded east along Route 243 until it met Route 63 again in the Westville neighborhood of New Haven. In 1951, the southern segment of Route 114 was relocated and extended south to its current terminus at Route 1 using former SR 442. The old alignment became an unsigned state-maintained road.