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Officers from the Met's Counter Terrorism Command arrested the teenager on Monday, 27 June, following a Schedule 7 stop at Stansted Airport.
He was due to board an outbound flight.
He was arrested on suspicion of collecting information likely to be useful to a person committing or preparing an act of terrorism (contrary to section 58 of the Terrorism Act 2000), and disseminating terrorist publications (contrary to section 2 of the Terrorism Act 2006).
He has been detained under PACE, and is in custody at a London police station while enquiries continue.
As part of the investigation, a search warrant was executed at an address in east London. This search has been completed.
The alleged offences are linked to extreme Islamist ideology.