A Brisbane teenager missing for two days has been reunited with his family after being found safe.

Connaire Daniels, 13, was last seen at the family's Salisbury house in the city's south about 11:30am on Sunday.

His mother, Margaret, said he was planning to catch a train to the city and meet up with friends at South Bank, but he never returned home.

His Facebook account was deactivated shortly after a message about his disappearance was posted.

Adding to the worries was that Connaire is diabetic and requires insulin.

On Monday night police said the teenager had been found safe at Tingalpa, about 20 kilometres from the family home.

They say his disappearance is not suspicious.

Ms Daniels told the ABC Connaire is now back home.

She thanked the response from social media in helping with the case.

Earlier on Monday, Ms Daniels said it was not known if Connaire ever made it to Southbank.

"You think okay, he's missed the train. I got in the car and went for a drive and couldn't find him," she said.

"You just start thinking, unfortunately, all the worst. So, you know, Daniel Morcombe comes into your mind because he was 13."

Ms Daniels described her son as a happy boy.

"He and his dad had recently gone halves in a tinnie, and they'd been shopping and bought a couple of bits and pieces on Saturday," she said.

"Everything was fine. He'd sent an email to find when rugby trials are this week.

"He's very much a home boy. He doesn't tend to go out, he's still only 13.

"We never really let any of the kids do that."