Season 4

The Fourth and final Season of Phineas and Ferb was officially announced on August 25, 2011. It had been renewed as part of a multi-year, multi-million dollar deal between creators Dan Povenmire, Jeff "Swampy" Marsh, and Disney. On November 9, 2011, it was announced that the fourth season will pick up with new episodes rolling out through 2014. The first half premiered on Disney Channel US then from March 1 onward, the episodes will now air on Disney XD, like what happened in the second season.

However, starting Friday, June 20, those episodes will air on Disney Channel on certain Fridays, as part of the channel's "Disney XD on Disney Channel" block.

The season started with "For Your Ice Only", a winter-themed sports episode and "Happy New Year!", a celebration of New Years Day on December 7, 2012 on Disney Channel US and December 31, 2012 on Disney XD.

Some celebrity guests include Luc Robitaille, Samantha Bee, Jaime Pressly, Parry Gripp, Wayne Brady, Kelly Osbourne, Maia Mitchell, Simon Baker, Goldie Hawn, Elizabeth Banks, Leah Remini , Simon Pegg and, his colleague, Nick Frost, Billy Gardell , Chef Gordon Ramsay Jay Leno and Gravity Falls creator/executive producer Alex Hirsch.

Other episodes include "Sidetracked" and "Primal Perry", a commemoration of Platypus Day, an episode that succeeds the events of Phineas and Ferb The Movie: Across the 2nd Dimension, along with some crossover episodes featuring in the Marvel Universe and in the Star Wars Universe, a Valentine's Day themed special set ten years in the future, and finally a musical featuring the one-hit wonder Phineas and the Ferb-Tones.

On May 7, 2015, it was officially announced that the series finale would air on June 12, 2015 on both Disney Channel and Disney XD, followed by a standalone special airing in the fall.

Title sequence changes from Season 3
The title sequence remains the same, but images from Phineas and Ferb The Movie: Across the 2nd Dimension, "Doof Dynasty", "Moon Farm", "The Remains of the Platypus", "Escape from Phineas Tower", "Tri-Stone Area", "Excaliferb", and "Bully Bromance Breakup" replace the ones from Season 2.

Episodes
In the table below, the following abbreviations are used: DXD = Disney XD; DC US = Disney Channel US; Ep. # = Episode number; Vol. # = Volume number.

Background Information

 * This is the second season after Season 2 to have several episodes air on Disney XD first. The first one in this season: "Primal Perry".
 * This is the longest season.