A list of events that occurred on April 4 related to Six Flags.
- 1980 – Six Flags Over Mid-America opens for the 1980 season.
- 1981 – Six Flags Over Mid-America opens for the 1981 season.
- 1998 – The Riddler's Revenge opens at Six Flags Magic Mountain.
Other events[]
- 1923 – Warner Bros. is founded.