Regan Henson, 14, was last seen at around 1.30pm on Sunday 21 July 2024.
She is believed to have walked to Hollingbourne railway station where she caught a train to an unknown location, although she has previously travelled to Ashford.
Regan was last wearing a black hooded top and bottoms, dark blue Nike sliders and pink socks.
If you see her or know where she is, please call 999 quoting reference 21-0795.