She was believed to have caught the train to King's Cross and then headed to Islington.
Alice Brindley, of Ixworth Thorpe, had last been seen around 6.30pm yesterday at Cambridge railway station, from where she travelled to London.
A 13-year-old girl who went missing from Ixworth near Thorpe has been found safe and well.
He wrote: 'Can everyone please retweet my lovely little girl has gone missing any help to find her would be greatly appreciated to bring her home'.
She had known the two friends for years, as had her parents, but Mr Brindley said each friend was under the impression Alice was travelling home with the other.
He also posted a selfie took of herself just hours before she was last seen.
Mr Brindley, an executive director at ExCel London, said his daughter had never done this before.
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Alice is described as white with collar-length red hair.
She was wearing a grey hooded jumper underneath a dark-coloured Ralph Lauren padded jacket, black skinny jeans, black trainers and carrying a black leather rucksack with gold-coloured zips.
Police officers are asking anyone who may have seen Alice or has any information about her whereabouts to contact Suffolk Constabulary on 101.
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