The five-week old moggie was discovered in the staff car park clinging onto the engine after a passer-by heard meowing sounds coming from under the bonnet.
Nicknamed 'Jammy' by airport staff because of her links to the famous jam factory in Tiptree, she is believed to have crawled into the compartment seeking warmth and comfort overnight.
RSPCA Inspector Rosie Russon, who was called to Stansted to check Jammy's health, said:
"Jammy was most likely just looking for a nice place to sleep. The good news is she's safe and well after her ordeal - although she may have used up one of her nine lives! Finding an owner will be difficult because Jammy wasn’t tagged, she was probably just discarded from the litter."
The stowaway kitten has been adopted by Stansted Airport Security Advisor, Becky Corris, who helped with the delicate rescue operation to coax the cat out of the car.
"She's absolutely adorable and seemed to warm to me straight away," said Becky.