Spider-Man: Far From Home and not Avengers: Endgame will close out the third phase of the Marvel Cinematic Universe. Fans would be forgiven for thinking that the Avengers' final outing corresponded with the end of the current phase given its conclusive title. Marvel's Kevin Feige suggested otherwise at an event in Shanghai, however.
According to Feige, the next Spiderman installment will complete the third stage when it opens in July, this year. There is some precedence for this when you consider that the relatively light Ant-Man as opposed to Age of Ultron, closed out the second phase. There are also interesting implications for what that Far From Home world will look like, post-Endgame.
The forthcoming Guardians Of The Galaxy, Doctor Strange, and Black Panther along with a Black Widow spin-off will all take place in the fourth phase.