The airfield was opened in 1933 as a civilian facility, but was requisitioned at the outbreak of World War II and named RAF Trebelzue to support other bases in the Cornwall area. The base was renamed RAF St Mawgan in 1943, after expansion. The facility was then handed to the USAAF and there were a number of improvements, including the building of a new control tower and expansion of the current runway. The airfield was put under maintenance in 1947, and reopened as a Coastal Command base in 1951.