Ania Louise Czopinski from Whitley Bay in northeast England was last seen on November 11th walking through Kraków-Balice Airport at approximately 11 p.m.
CCTV footage shows the 18-year-old with a white suitcase and holding what appears to be some documents.
But according to police, the teenager had traveled to Poland via Dublin without any documents.
In a police appeal published on social media, the missing 18-year-old was described as being between 160 to 170 cm in height with a slim build, straight nose and long dark blond hair.
The description added that the Briton was wearing grey jeans with holes in the knees, a black jacket and black trainers.
According to the appeal, Czopinski does not speak Polish and had travelled without a passport.
The statement added that her family had not had any contact with her since her disappearance.
This is not the first time Czopinski has gone missing—in August, Czopinski was reported missing after failing to return home to Whitley Bay after attending a music festival in Leeds.
On that occasion, mother Justine Zellas took to Facebook describing her daughter as “missing and vulnerable”.