Under the Portuguese Immigration law, foreign minors under 18 years of age entering or exiting Portugal must be in possession of an authorization letter of parental consent to travel, if travelling with adults other than their parent/s or legal guardians. The document must be signed and dated, with the signature(s) certified by a notary. The letter of parental consent to travel must include the dates and reason for travel and the details of an adult who will be responsible for the child.

Please read information posted by the Portuguese Immigration