Denisa Tanase, 36, was working on the Wizz Air flight when she spotted a stunning view out of the window.
The mother-of-two grabbed her phone and took a video, but thought nothing more of it.
When she reviewed the footage 20 minutes later, she saw an unidentified flying object.
Ms Tanase, from Corby, Northamptonshire, said: ‘I’ve been a flight attendant for a year and have never seen anything like this.
‘I couldn’t see anything with my bare eyes.
‘But when I checked the video 20 minutes later, I spotted it and I spoke to the pilot to ask if they knew anything.’
She added: ‘Everyone was confused. They hadn’t seen anything while flying and there had been no turbulence.
‘It was a weird shape, like a circle flashing pink.
‘At first we thought maybe it was a reflection of our pink uniform but on the video you can see the motion – you can see it’s flying.’
Despite being confused by what she caught on film, Ms Tanase was not concerned by the footage.
She had always wondered about whether alien life could exist, but she is now sure that it does.
Ms Tanase said: ‘I was just happy that I got something on film. I thought: “How is this possible?”
‘I’ve seen stuff before on the internet and thought, “hmm this could be PH๏τoshop”, but I had it on video myself.
‘Now I definitely believe more than before.
‘My family and friends think it is definitely aliens. My husband said: “You’re my wife, I believe you.”‘
Ms Tanase, who has travelled all over Europe with Wizz Air, has not seen any other UFOs since the incident last week and has been continuing with her job as normal.
