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. How to fill out the Child Travel Consent Form Instructions and Guide? A parent or guardian must complete this form and have it notarized no earlier than 30 days prior to departure. A consent letter demonstrates that a child has permission to travel outside Canada from every parent or guardian who is not accompanying them on the trip. A child travel consent form is a legal document proving that a child has received permission to travel, either alone or with an adult. There are forms you can download and sign for this. Send them with POAs, insurance cards, and this form.