Use our Child Travel Consent form to prove that a child can travel without their parents or guardians. Children under 18 may need a Letter of Consent to travel internationally without both parents.Country-specific regulations. See what documents a child needs to travel to or from the US alone or with a parent or relative. Non-US citizen children traveling to the US. A child travel consent form allows a minor to travel alone or with another person or group. A travel consent form is a statutory document granting authorization for a minor to travel without legal guardians or one or both parents. The default rule is typically for both parents to consent to the child's trip abroad.