The squadron was part of RAF Fighter Command between 1941 and March 1944 when it joined the 2nd Tactical Air Force until the end of the war.

[1] On 4 May 1942, the squadron moved south to RAF North Weald,[4] having re-equipped with the Supermarine Spitfire IIA in November 1941.

Together they were known as North Weald Wing and were part of the Allied air umbrella over the landing area in the Dieppe Raid, and later flying fighter sweeps and escort operations over occupied France and the Low Countries.

[7] Following fighter bomber and tactical air superiority operations, connected to preparations for D-Day and the actual landings in France, the squadron moved to Caen, Normandy, in August 1944.

From September onwards, 132 Wing participated in the liberation of the Netherlands and provided air support for the crossing of the Rhine.

[8] Following the end of the war, the wing flew to Norway and on 22 May 1945, 331 Squadron was officially disbanded as an RAF unit, with control passed to the re-formed Royal Norwegian Air Force (RNoAF) on 21 November 1945.