where is london canada
London (Ontario). London [1] is a medium-sized city in Ontario, Canada. It is located west of Toronto, between Lake Huron and Lake Erie at the fork of the Thames River (not to be confused with the River Thames in London, England).ighway 402 runs due west from it's connection to the 401 in south-west London and ends about 100 km to the west at the Ontario-Michigan boarder in Sarnia. The speed limit on the 401 in most parts is 100 km/h, but expect most people to be travelling at ~120 km/h in good conditions.