Barnacle Bill, who washed up on Chouet after Storm Ciaran, has put on nearly one pound in weight and is ready to travel.
The GSPCA will fly the small female loggerhead turtle back to Gran Canaria in a private jet in the New Year.
Barnacle Bill will be joined on the journey by a shelter staff member to ensure she arrives safely.
Charity manager Steve Byrne says her recovery has been amazing:
"We've been feeding Barnacle Bill a mixture of squid which our last turtle really enjoyed and also bits of fish.
She's been eating really really well, for such a small turtle to put on 400 grams in such a short period of time is just incredible and we are really pleased."
A chip has been put in the creature's front left shoulder so Barnacle Bill can be identified in the future.
She was named after the shellfish attached to her which were removed by a local vet shortly after being taken to the GSPCA but it's understood despite the name, she is female.
Steve Byrne says adjusting after the flight may take her some time.
Thousands for Guernsey and Jersey schools to boost active travel
Personal reasons prompt Guernsey Deputy’s departure from ESC
New Aurigny aircraft flies into Alderney
Guernsey's Victor Hugo Centre reaches fundraising milestone and unveils sculpture
Guernsey's police complaints process not 'in crisis'
Guernsey could be disgraced Andrew’s new home - Royal biographer
Guernsey Museums close for the season
First visit of an EU ambassador to Guernsey
