How do I write a consent letter for my child to travel? A child travel consent form allows a minor to travel alone or with another person or group.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. We will be sharing some family travel tips about what documentation is needed, such as a travel consent letter, for international travel with a minor. Use a child (minor) travel consent form to let someone under 18 travel alone or with someone other than their legal caretakers. 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. If children are not travelling with both their parents, (ie: if they are travelling alone, or with another adult), this form can be used to give permission. A minor (child) travel consent form shows that a child has permission to travel without both parents or legal guardians.