The following is a list of marathons of Phineas and Ferb episodes that aired on Disney Channel, Disney XD, and Toon Disney.
Disney Channel[]
- Phineas and Ferb-ruary (February 1–29, 2008)
- If It's Not One Thing, It's Your Brother Marathon (May 24, 2008)
- Spot the Diff (August 8, 2008)
- Whatcha Doin'? Marathon (December 26, 2008)
- Phineas and Ferb's Memorial Day Marathon (May 25, 2009)
- Phineas and Ferb Musical Cliptastic Countdown Week (October 12-16, 2009)
- Doof's Dastardly Schemes Marathon (December 11, 2009)
- Secret Agent Showdown Marathon (March 12, 2010)
- The Fast and the Phineas Day (UK marathon) (May 3, 2010)
- Doofenshmirtz Doofathon-inator Monday (May 31, 2010)
- Full Day Phineas and Ferb Marathon (August 6, 2010)
- Platypus Day 2011 (March 5, 2011)
- Cliptástico 2 (Brazil/Latin America marathon) (May 19, 2011)
- Phineas and Ferb's Backyard Bash (June 18, 2011)
- Toonin' To Go Doofin' (July 23, 2011)
- Fan Picked Phineas and Ferb Week (August 1–5, 2011)
- Very Very Fast & Phineas Blowout (Asia marathon) (August 8–11, 2011)
- Vote-inator (Spain/Portugal/Israel/Poland/Italy/France marathon) (September 2, 2011)
- Cliptástico 2 (Spain marathon) (December 2, 2011)
- Cliptástico 2 (Portugal marathon) (December 5-9, 2011)
- Time Shift (January 13–16, 2012)
- Platypus Day 2012 (March 3, 2012)
- Toonin' To Go Doofin' (Asia marathon) (March 12, 2012)
- Secret Agent Week (August 20–24, 2012)
- Platypus Day 2013 (March 2, 2013)
- Platypus Day 2014 (March 1, 2014)
- Perry-calipsis (Brazil/Latin America marathon) (June 1-27, 2015)
- Phineas and Ferb Best 24 Hours Ever! (Asia marathon) (February 9–10, 2017)
- Phineas and Ferb Weekend Marathon (August 22-23, 2020)
- Phineas and Ferb Break Into Spring (April 14-18, 2025)
- Phineas and Ferb's Summer Marathon (May 26-June 4, 2025)
Disney XD[]
- Phineas and Ferb All Day Marathon (February 16, 2009)
- Phineas and Ferb's Action Packed Easter (Spain/UK marathon) (April 2009 and April 9, 2011)
- I Know What We're Gonna Do Today Marathon (April 26, 2009)
- The Phineas and Ferb All-Day Long Marathon (June 13 and 14, 2009)
- Phineas and Ferb's Tricked Out Marathon (August 9 and 10, 2009)
- Phineas and Ferb Mysteries Revealed Marathon (September 13, 2009)
- Phineas and Ferb All Weekend Long Marathon (December 5-7, 2009)
- The Spy Who Shoved Me Marathon (February 7 and September 5, 2010 and July 11, 2011)
- Phineas and Ferb's Super Summer Takeover (UK marathon) (Summer 2010)
- Phineas and Ferb Fridays (UK marathon) (September 2010 and October 2013)
- Ferbtober (UK marathon) (October 7–21, 2010 and October 6-18, 2011)
- Spy Sunday (UK marathon) (October 10, 2010)
- Agent P's Top 10 Saves (October 10, 2010)
- Phineas and Ferb Chowdown Chatathon (November 24, 2010)
- Ferbruary (UK marathon) (February 3–16, 2011 and February 6-22, 2012)
- U Can't Bust This Marathon (February 26, 2011)
- Phineas and Fools Day (UK marathon) (April 1, 2011)
- Spot the Doof Marathon (November 11, 2011)
- Phineas and Ferb All Day Marathon (2011 marathon) (December 31, 2011)
- Inator Bowl of Evil (February 5, 2012)
- Disney XD Ma-some Marathon (May 13, 2012)
- Around the World Marathon (August 4, 2012)
- Agent P Super Spy Marathon (November 11, 2012)
- Doof's Marathon-Inator Dooms-Day Marathon (December 2, 2012)
- The Phineas and Ferb All-Day Long Marathon (2013 marathon) (January 6, 2013)
- Phineas and Ferb Out of This World Marathon (May 12, 2013)
- Dr. Doofenshmirtz's Marathon-Inator (June 23, 2013)
- Agent P Super Spy-A-Thon (March 29, 2015)
- Phineas and Ferb Out of This World Marathon (2015 marathon) (April 16, 2015)
- Phineas and Ferb Music-Fest (May 10, 2015)
- Phineas and Ferb Last Days of Summer Marathon (June 9–12, 2015)
- I Know What We're Gonna Do in May (May 1-24, 2018)
- Phineas and Ferb Takeover Takedown Marathon (May 25-28, 2018)
- One Giant Marathon (August 25-28, 2020)
- 4th of July Weekend Takeover (July 3-6, 2021)
- Phineas and Ferb Start of Summer Celebration (May 23-27, 2022)
- Phineas and Ferb End of Summer Celebration (August 1-5 and 8-12, 2022)
Toon Disney[]
- Phineas and Ferb's Frighteningly Top-Secret Marathon (October 13 and 31, 2008)
- Phineas and Ferb All Weekend Long Marathon (November 15–16, 2008 and January 23-25, 2009)