Flash Airlines Flight 604 was a charter flight provided by Egyptian private charter company Flash Airlines. On 3 January 2004, the Boeing 737-300 that was operating the route crashed into the Red Sea shortly after takeoff from Sharm El Sheikh International Airport, killing all 135 passengers, most of whom were French tourists, and all thirteen crew members. The findings of the crash investigation were controversial, with accident investigators from the different countries involved unable to agree on the cause of the accident.

Flight 604 was the deadliest air disaster in Egypt until it was surpassed almost twelve years later by the bombing of Metrojet Flight 9268. It remains the deadliest accident involving a 737 Classic aircraft.