King's Highway 418, or simply Highway 418, is a controlled-access highway and former tolled highway in the Canadian province of Ontario. The 400-series highway is 9.2 km (5.7 mi) long, travelling through the Regional Municipality of Durham to connect Highway 401 with the eastern extension of Highway 407. The freeway is located entirely within the Municipality of Clarington near Durham Regional Road 34 (Courtice Road).