A teenage girl missing from Brisbane's west for almost a week has been found safe and well.

Elly O'Meley, 14, was last seen in Ellen Grove on the afternoon of May 28.

Police said initial investigations suggested she might have been with a man in his mid-30s, who was not a relative, travelling in a light green 1996 Holden Commodore, registration 532 YDT.

Elly is described as Caucasian in appearance, 165 centimetres tall, with a slim build, long brown hair and brown eyes.

AAP