Hollie Bishop, 15, was last seen in Ashford town centre at around 2pm on Friday, September 19, before boarding a train to the city later that day.
She is thought to have been in the Brixton area at about 9pm.
CCTV images now released are suspected to show Hollie at London Victoria train station at around 10.30pm that same evening.
Hollie is described as being about 5ft 8ins tall with shoulder-length hair recently coloured red.
She may have been wearing a dark top and either a skirt or shorts, along with white shoes.
She also has links to Scotland.
Anyone with critical information about Hollie’s whereabouts should call 999 quoting reference 19-0803.
Other information can be reported via 101 or the live chat function on the Kent Police website.