Intended as RAF Westcott's satellite, the land at Field Farm had been requisitioned by the War Office, and the airfield built. RAF Oakley was ready before its parent station so, when it opened on 27 May 1942, it became RAF Bicester's second satellite. In August 1942 it switched to its intended status and when No. 11 Operational Training Unit RAF moved to Westcott in September 1942, and Oakley became that unit's satellite where it placed some of its Vickers Wellington IC's.
In the Autumn of 1943, Hercules-engined Wellingtons came increasingly into use and the OTU's air gunnery training section was located at Oakley. Conversion training for bomber crews was Oakley's primary role, which continued to the end of the war during the final year of which most personnel were trained for overseas squadrons.
RAF Oakley closed to flying in August 1945, but remains very visibly a wartime airfield, whose main runway remains largely intact like a 'T2' hangar retaining its wartime black finish. Temporary brick wartime buildings stand alongside and Oakley holds one special feature, a well-preserved 'B1' hangar.