Episodes you can recall

soem names may be different depending where you are from. As I watched season 5 on youtube and tehyw ere different to the names on TV.
Season 1-
-It Feels Like Magic
-Welcome To Magix
-Alfea College for Faires
-The Voice Of Nature
-Date With Disaster
-Mission At Cloud Tower
-The Day Of The Rose
-Miss Magix
-The Nightmare Monster
-The Army Of Decay
-Power Play
-Battle For Alfea
-Fire And Ice
-The Senior Witches Attack

That is all I can remember. I know a lot of season 1 though.

Season 2-
-Back To School
-Pricess Of Tides
-Into The Under Realm
-The Queen Of Perfection
-Angel Of Doom
-Homesick
-Magic In My Heart
-Hallowinx
-The First Charmix
-Trouble In Paradise
-Storming Shadowhaunt

Season 3-

-The Princess's Ball
-Beauty Is A Beast
-Pretty Pretty Princess
-Mirror Of Truth
-Mission To Tides
-Point Of No Return
-Payback
-The Power Within
-The Omega Dimension
- Seeking The Truth
-The Spell Of Elements

Season 4-
These are probably out of order.

-Winx On Earth
-Fear In Pixie Village
-Dad I'm A Fairy
-Wizards Of The Black Circle
-Dianna's Attack
-In The Amozon Forest
-Home At Last
-Superheros

Season 5-
-The Power Of Harmonix
-The Book Of Sirenix
-Sirenix
-A Magix Christmas
-The Problems Of Love
-The Singing Whale

These are all I know. Season 5 and 4 are not my best seasons. 1 and 2 I pretty much know every episode of by heart.

Season 1:
An Unexpected Event
Alfea College for Fairies
Date of Disaster

Season 2:
Princess Amentia

XD I watch seasons 1 and 2 episodes without knowing the name.

Season 3:
Don't remember

Season 4:
A Fairy in Danger
Winx Believix!
7, The Perfect Number
Nebula

That's all I can remember.

Season 5:
The Spill
The Gem of Empathy
The Shimmering Shells
A Magix Christmas
Sirenix
The Eclipse
Saving Paradise Bay
The Fall of Tritannus

season 1:
An unexpected event
More than a high school
voice of nature
Something disaster
Grounded
Day of the rose
Spelled/ betrayed
Junior league
Miss magix
Sparks of hope
Battle for alfea
The final battle

Season 2:
Princess of tides
queen of perfection
Party monster
Angel of doom
Reaching for the sky
Homesick
Gangs of gardenia
Battle on planet Eraklyon
Magic from the heart?
Hallowinx
Exchange students
The heart of cloud tower
The first charmix
Trouble in paradise
Desperately seeking bloom
Storming shadowhaunt
The ultimate power couple

Season 3:
The princess ball
Beauty is a beast
The mirror of truth
Aisha's courage
A heros past
Disloyal advisary
Operation boyfriend rescue
Alfea under seige
The black willow
Tecna's sacrifice
Payback
The island of dragons
The omega mission
Day at the museum
Biker chick wedding crashers
Crystal labrinyth

Season 4:
The fairy hunters
The tree of life
Love and pet
A fairy in danger
Winx believix
The white circle
Nebula
Musa's song
Winx forever
Dad i'm a fairy
The wizards attack
7: the perfect number
A virtual hideout
The enchanted island
Nature rage
In Diana's kingdom
Bloom's trial
Fire and ice
The omega dimension

Season 5:
The lilo
The spill
the rise of tritannus
The sirenix book
The power of harmonix
Shimmering shells
The secret of the ruby reef
Gem of empathy
A magix christmas
trix tricks
The gem of courage
Sirenix
The emperors throne
The eclipse
The pillar of light
Faraway reflections
The devourer
the singing whales
The problems of love
the perfect date
Listen to your heart
Sharks eye
Saving paradise bay
The last discovery
The fall of tritannus
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I hope this helped, some names are not on the dot but they're really close. ^_^