Season 5 of Phineas and Ferb has 20 episodes.

Quick Scoop: Season 5 Episode Count

Disney’s revival of Phineas and Ferb returned with a fifth season consisting of 20 half‑hour episodes.

These 20 episodes make up Season 5, with an additional 20 planned for Season 6, for a total of 40 across the revival deal.

A few handy points:

  • Season 5 is slightly shorter than some earlier seasons, which often had more than 20 segments or episodes.
  • The revival order was structured as two seasons of 20 episodes each under the new deal.
  • Episode guides and fan wikis list Season 5 as 20 distinct episode entries (each a half‑hour slot, often with two 11‑minute stories).

In practice, if you’re planning a rewatch, you can think of Season 5 as a 20‑episode run that completes its broadcast in under a year, from June 2025 into early 2026.

TL;DR: Season 5 of Phineas and Ferb has 20 episodes.

Information gathered from public forums or data available on the internet and portrayed here.