| Unit Name: | No. 251 Squadron RAF |
| Dates: | 31 May 1918 - 30 June 1919, 1 August 1944 - 30 October 1945 |
| Country: | United Kingdom |
| Branch: | Royal Air Force |
| Command Structure: | RAF Coastal Command |
| Garrison Label: | Base |
| Motto: | "However wind blows."[1] |
| Identification Symbol: | A weathercock |
| Identification Symbol Label: | Squadron Badge heraldry |
| Identification Symbol 2 Label: | Post 1950 squadron roundel |
| Identification Symbol 3: | AD Aug 1944 - Oct 1945 |
| Identification Symbol 3 Label: | Squadron Codes |
No. 251 Squadron was a Royal Air Force Squadron which operated during the First World War and the Second World War. The Squadron was disbanded in 1945 and remains inactive.
No. 251 Squadron RAF was first formed in August 1918 from Nos. 504, 505, 506 and 510 (Special Duty) Flights based at Hornsea but operating from Atwick, RAF Greenland Top/Stallingborough) and Owthorne. The Squadron flew anti-submarine patrols on the coast of Yorkshire for the remainder of World War I and was then disbanded on 30 June 1919.[2]
No. 251 Squadron was then reborn after No. 1407 (Meteorological) Flight, stationed at Reykjavík, was renumbered for air-sea rescues on 1 August 1944. 1407 Flight was formed in October 1941, receiving Lockheed Hudson aircraft in April 1942. The number of aircraft was expanded in November with more Hudsons and a few Handley Page Hampdens. The latter were replaced with Lockheed Venturas in 1943.
The new Squadron also operated as Meteorological Reconnaissance until it was finally disbanded in October 1945.[3]
During its first time in operation, the Squadron flew:
During its second time in operation, the Squadron flew: