Futurama started with 5 seasons and then it was cancelled.
Then there are 4 movies which were later broken up into 4 episodes each.
Then there were 4 more seasons, each released a year apart from each other.

Sometimes the last 4 seasons are combined to form 2 'volumes'.
Sometimes the first 5 seasons are combined and rearranged into 4 'volumes'.
Sometimes the movies are counted as season 5, sometimes as season 6. Sometimes they aren't considered a season.

 

As usual, here is the correct order based on release date:

Season 1

Episode 1 - Space Pilot 3000 (Mar 28, 1999) Aired right after the Superbowl
Episode 2 - The Series Has Landed (Apr 4, 1999)
Episode 3 - I, Roommate (Apr 6, 1999)
Episode 4 - Love's Labours Lost in Space (Apr 13, 1999)
Episode 5 - Fear of a Bot Planet (Apr 20, 1999)
Episode 6 - A Fishful of Dollars (Apr 27, 1999)
Episode 7 - My Three Suns (May 4, 1999)
Episode 8 - A Big Piece of Garbage (May 11, 1999)
Episode 9 - Hell is Other Robots (May 18, 1999)


Season 2

Episode 1 - A Flight to Remember (Sept 26, 1999)
Episode 2 - Mars University (Oct 3, 1999)
Episode 3 - When Aliens Attack (Nov 7, 1999)
Episode 4 - Fry and the Slurm Factory (Nov 14, 1999)
Episode 5 - I Second That Emotion (Nov 21, 1999)
Episode 6 - Brannigan, Begin Again (Nov 21, 1999)
Episode 7 - A Head in the Polls (Dec 12, 1999)
Episode 8 - Xmas Story (Dec 19, 1999)
Episode 9 - Why Must I Be a Crustacean in Love? (Feb 6, 2000)
Episode 10 - Put Your Head on My Shoulders (Feb 13, 2000)
Episode 11 - The Lesser of Two Evils (Feb 20, 2000)
Episode 12 - Raging Bender (Feb 27, 2000)
Episode 13 - A Bicyclops Built for Two (Mar 19, 2000)
Episode 14 - How Hermes Requisitioned His Groove Back (Apr 2, 2000)
Episode 15 - A Clone of My Own (Apr 9, 2000)
Episode 16 - The Deep South (Apr 16, 2000)
Episode 17 - Bender Gets Made (Apr 30, 2000)
Episode 18 - The Problem With Popplers (May 7, 2000)
Episode 19 - Mother's Day (May 14, 2000)
Episode 20 - Anthology of Interest 1 (May 21, 2000)

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Season 3

Episode 1 - The Honking (Nov 5, 2000)
Episode 2 - War is the H-Word (Nov 26, 2000)
Episode 3 - The Cryonic Woman (Dec 3, 2000)
Episode 4 - Parasites Lost (Jan 21, 2001)
Episode 5 - Amazon Women in the Mood (Feb 4, 2001)
Episode 6 - Bendless Love (Feb 11, 2001)
Episode 7 - The Day the Earth Stood Stupid (Feb 18, 2001)
Episode 8 - That's Lobstertainment! (Feb 25, 2001)
Episode 9 - The Birdbot of Ice-Catraz (Mar 4, 2001)
Episode 10 - The Luck of the Fryish (Mar 11, 2001)
Episode 11 - The Cyber House Rules (Apr 1, 2001)
Episode 12 - Insane in the Mainframe (Apr 8, 2001)
Episode 13 - Bendin' in the Wind (Apr 22, 2001)
Episode 14 - Time Keeps on Slipping (May 6, 2001)
Episode 15 - I Dated a Robot (May 13, 2001)

Season 4

Episode 1 - Roswell That Ends Well (Dec 9, 2001)
Episode 2 - A Tale of Two Santas (Dec 23, 2001)
Episode 3 - Anthology of Interest II (Jan 6, 2002)
Episode 4 - Love and Rocket (Feb 10, 2002)
Episode 5 - Leela's Homeworld (Feb 17, 2002)
Episode 6 - Where the Buggalo Roam (Mar 3, 2002)
Episode 7 - A Pharoah to Remember (Mar 10, 2002)
Episode 8 - Godfellas (Mar 17, 2002)
Episode 9 - Future Stock (Mar 31, 2002)
Episode 10 - A Leela of Her Own (Apr 7, 2002)
Episode 11 - The 30% Iron Chef (Apr 14, 2002)
Episode 12 - Where No Fan Has Gone Before (Apr 21, 2002)

Season 5

Episode 1 - Crimes of the Hot (Nov 10, 2002)
Episode 2 - Jurassic Bark (Nov 17, 2002)
Episode 3 - The Route of All Evil (Dec 8, 2002)
Episode 4 - A Taste of Freedom (Dec 22, 2002)
Episode 5 - Kif Gets Knocked Up a Notch (Jan 12, 2003)
Episode 6 - Less Than Hero (Mar 2, 2003)
Episode 7 - Teenage Mutant Leela Hurdles (Mar 30, 2003)
Episode 8 - The Why of Fry (Apr 6, 2003)
Episode 9 - The Sting (Jun 1, 2003)
Episode 10 - The Farnsworth Parabox (Jun 8, 2003)
Episode 11 - Three Hundred Big Boys (Jun 15, 2003)
Episode 12 - Spanish Fry (Jul 13, 2003)
Episode 13 - Bend Her (Jul 20, 2003)
Episode 14 - Obsoletely Fabulous (Jul 23, 2003)
Episode 15 - Bender Should Not Be Allowed on TV (Aug 3, 2003)
Episode 16 - The Devils Hands are Idle Playthings (Aug 10, 2003) Original Series Finale
 

Season 6 - The Futurama Movies

1. Bender's Big Score (Mar 23, 2008) Episodes 1-4

2. The Beast With a Billion Back (Oct 19, 2008) Episodes 5-8

3. Bender's Game (Apr 26, 2009) Episodes 9-12

4. Into the Wild Green Yonder (Aug 30, 2009) Episodes 13-16

Season 7

Episode 1 - Rebirth (Jun 24, 2010)
Episode 2 - In-A-Gadda-Da-Leela (Jun 24, 2010)
Episode 3 - Attack of the Killer App (Jul 1, 2010)
Episode 4 - Proposition Infinity (Jun 8, 2010)
Episode 5 - The Duh-Vinci Code (Jun 15, 2010)
Episode 6 - Lethal Inspection (Jun 22, 2010)
Episode 7 - The Late Philip J. Fry (Jun 29, 2010)
Episode 8 - That Darn Katz (Aug 5, 2010)
Episode 9 - A Clockwork Origin (Aug 12, 2010)
Episode 10 - The Prisoner of Benda (Aug 19, 2010)
Episode 11 - Lrrreconcilable Ndndifferences (Aug 26, 2010)
Episode 12 - The Mutants are Revolting (Sep 2, 2010)
Episode 13 - The Futurama Holiday Spectacular (Nov 21, 2010)

Season 8

Episode 1 - Neutopia (Jun 23, 2011)
Episode 2 - Benderama (Jun 23, 2011)
Episode 3 - Ghost in the Machines (Jun 30, 2011)
Episode 4 - Law and Oracle (Jul 7, 2011)
Episode 5 - The Silence of the Clamps (Jul 14, 2011)
Episode 6 - Yo Leela Leela (Jul 21, 2011)
Episode 7 - All the Presidents' Heads (Jul 28, 2011)
Episode 8 - Möbius Dick (Aug 4, 2011)
Episode 9 - Fry Am the Egg Man (Aug 11, 2011)
Episode 10 - Tip of the Zoidberg (Aug 18, 2011)
Episode 11 - Cold Warriors (Aug 25, 2011)
Episode 12 - Overclockwise (Sep 1, 2011)
Episode 13 - Reincarnation (Sep 8, 2011)

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Season 9

Episode 1 - The Bots and the Bees (Jun 20, 2012)
Episode 2 - A Farewell to Arms (Jun 20, 2012)
Episode 3 - Decision 3012 (Jun 27, 2012)
Episode 4 - The Thief of Baghead (Jul 4, 2012)
Episode 5 - Zapp Dingbat (Jul 11, 2012)
Episode 6 - The Butterjunk Effect (Jul 18, 2012)
Episode 7 - The Six Million Dollar Mon (Jul 25, 2012)
Episode 8 - Fun on a Bun (Aug 1, 2012)
Episode 9 - Free Will Hunting (Aug 8, 2012)
Episode 10 - Near-Death Wish (Aug 15, 2012)
Episode 11 - Viva Mars Vegas (Aug 22, 2012)
Episode 12 - 31st Century Fox (Aug 29, 2012)
Episode 13 - Naturama (Aug 29, 2012)

Season 10

Episode 1 - 2-D Blacktop (Jun 19, 2013)
Episode 2 - Fry and Leela's Big Fling (Jun 19, 2013)
Episode 3 - T.: The Terrestrial (Jun 26, 2013)
Episode 4 - Forty Percent Leadbelly (Jul 3, 2013)
Episode 5 - The Inhuman Torch (Jul 10, 2013)
Episode 6 - Saturday Morning Fun Pit (Jul 17, 2013)
Episode 7 - Calculon 2.0 (Jul 24, 2013)
Episode 8 - Assie Come Home (Jul 31, 2013)
Episode 9 - Leela and the Genestalk (Aug 7, 2013)
Episode 10 - Game of Tones (Aug 14, 2013)
Episode 11 - Murder on the Planet Express (Aug 21, 2013)
Episode 12 - Stench and Stenchability (Aug 28, 2013)
Episode 13 - Meanwhile (Sep 4, 2013) Series Finale

10 Years later they brought it back!

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Season 11

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Episode 1 -  The Impossible Stream (Jul 24, 2023)

Episode 2 - Children of a Lesser Bog (Jul 31, 2023)

Episode 3 -  How the West Was 1010001 (Aug 7, 2023)

Episode 4 -  Parasites Regained (Aug 14, 2023)

Episode 5 -  Related to Items You've Viewed (Aug 21, 2023)

Episode 6 -  I Know What You Did Next Xmas (Aug 28, 2023)

Episode 7 -  Rage Against the Vaccine (Sep 4, 2023)

Episode 8 -  Zapp Gets Cancelled (Sep 11, 2023)

Episode 9 -  The Prince and the Product (Sep 18, 2023)

Episode 10 - All the Way Down (Sep 25, 2023)

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Season 12

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Episode 1 - The One Amigo (2024)

Episode 2 - Quids Game (2024)

Episode 3 - The Temp (2024)

Episode 4 - Beauty and the Bug (2024)

Episode 5 - One Is Silicon and the Other Gold (2024)

Episode 6 - Attack of the Clothes (2024)

Episode 7 - Planet Espresso (2024)

Episode 8 - Cuteness Overload (2024)

Episode 9 - The Futurama Mystery Liberry (2024)

Episode 10 - Otherwise (2024)

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