Manchester City and Crystal Palace kick off at 16:30 on Saturday in Wembley on Saturday.
The Football Association said it had agreed to cooperate with the two clubs, broadcasters, local authorities, police and safety advisers.
Both the previous final matches, which were played by City and Manchester United, began at 15:00 because police would not allow it to be later, while the 2022 final between Chelsea and Liverpool was 16:4
No Premier League matches have been played for that day.