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.Minor children may be able to travel to another country without either one of their parents. The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. A Child Travel Consent Form is required where a minor child under the age of 18 is traveling internationally without both parents present. I was preparing documents and someone told me that I might need minor travel consent form since I am not leaving. One form is an authorization to travel with the child. It's just a freeform letter that says your children have permission to travel with their other parent. You might need a parental consent form. You might have to pay a fee for the unaccompanied minor service.