Flight 451 may refer to:
Linee Aeree Italiane Flight 451 (1954), crashed on 18 December 1954 Linee Aeree Italiane Flight 451 (1956), crashed on 24 November 1956 Japan Air System Flight 451, crashed on 18 April 1993 Helikopter Service Flight 451, crashed on 8 September 1997