Child Travel Consent Letter: When You Need One and What to Include

When a travel consent letter is required

Requirements vary by country, but a consent letter is strongly recommended and often legally required in a few common situations: when a child travels internationally with only one parent, when a child travels with a non-parent adult (grandparents, relatives, teachers, coaches), when crossing into Canada or Mexico (both countries explicitly recommend consent letters for minors crossing without both parents), and when the child's surname differs from the traveling adult's.

Even when it's not strictly mandatory, border agents have the discretion to ask. Lacking a letter causes delays. In some countries, the child won't be permitted to board or enter. The letter is cheap insurance against a significant disruption.

What the letter must include

A complete child travel consent letter should contain: the child's full legal name, date of birth, and passport number. The full name of the parent or guardian giving consent. If only one parent is consenting, include the other parent's name and the reason they aren't signing (absent, deceased, sole custody, etc.). The full name of the adult accompanying the child, if they are not a parent. The specific countries or destinations for the trip, since "any international destination" is less useful than naming the actual countries. Exact travel dates, both departure and return. A clear consent statement: "[Child's full name] has permission to travel with [accompanying adult's name] from [date] to [date] to [destinations]." Contact information for the consenting parent, including phone number and home address. Date and signature of the consenting parent.

Do you need a notary?

For US domestic travel, notarization isn't legally required but is a reasonable precaution.

For international travel, get the letter notarized. This is especially important for Canada, Mexico, the Caribbean, and Central and South America, where notarization is commonly required or recommended by government travel advisories. A notary's seal signals to foreign border officials that the document is legally witnessed.

If both parents are signing, both must appear before the notary. If only one parent is signing because of sole legal custody or because the other parent is deceased, bring supporting documentation (the custody order or death certificate) along with the notarized consent letter.

What to expect from airlines and border agents

Airlines on international routes often ask at check-in, particularly when a child's last name differs from the accompanying adult. Keep the letter in your carry-on, not in checked luggage.

Border agents in the destination country may request it on arrival. In Mexico, agents have detained children traveling with one parent who lacked documentation. In Canada, the Canada Border Services Agency explicitly recommends a letter signed by both parents.

If the non-traveling parent is deceased, bring the death certificate. If you have sole legal custody, carry the custody order. These documents combined with a notarized consent letter give you the clearest possible paper trail at any checkpoint.