The number of episodes in each season of Phineas and Ferb varies:
- Season 1 has 26 episodes.
- Season 2 has 39 episodes.
- Season 3 has 35 episodes.
- Season 4 has 37 episodes.
- Season 5, which premiered in 2025, has 20 episodes.
The fifth season has fewer episodes compared to earlier seasons and is part of the show's revival with two seasons having 40 episodes in total.
