Finnair Flight 405 was a scheduled domestic passenger flight between Oulu and Helsinki, Finland, that was hijacked on 30 September 1978. The Finnair operated Sud Aviation Caravelle with 44 passengers and 5 crew aboard was hijacked by an unemployed home building contractor. The aircraft shuttled between Helsinki, Amsterdam and Oulu, with passengers offloaded in exchange for ransom demands in cash. The aircraft finally returned to Oulu where the hijacker received more ransom demands and released the three crew hostages. He was then allowed home as part of the deal, but was arrested at his home the following day.
The 2013 Finnish drama film The Hijack That Went South, directed by Aleksi Mäkelä, has been made on the basis of the case.