Child Travel Consent Letters in Thailand: When You Need One and Which Version Works

Situations where a consent letter is advisable

A travel consent letter shows that a parent with parental authority who is not travelling knows about and permits the trip. Many countries use it to deter international parental child abduction and trafficking, and border officers are trained to look for it when a child's travel companion is not both parents.

Immigration officers, airlines, and embassies may ask to see it. They do not ask every time, but if they ask and you cannot produce one, travel can be delayed or refused. Preparing it in advance is the low-cost, low-risk option, especially for long-haul or multi-country trips.

• The child travels with one parent while the other still shares parental authority.
• The child travels with grandparents, relatives, teachers, or a school group.
• The child travels alone using an airline's unaccompanied minor service.
• Cross-border families where parents hold different nationalities or live in different countries.
• Visa applications for a child, where many embassies ask for both parents' consent.

Two tracks: the district-office consent and the notarised English letter

The first track is a consent recorded before the registrar at a district office (khet or amphoe). It is a Thai-language document that Thai authorities — immigration at Suvarnabhumi and the Department of Consular Affairs when issuing a child's passport — recognise readily.

The second track is a consent written in English or the destination country's language and signed before a notarial services attorney registered with the Lawyers Council of Thailand. This version is designed for foreign authorities, such as the destination border or an embassy reviewing a child's visa application.

Many families prepare both: the Thai version for departure from Thailand and the notarised English version for arrival abroad. If the destination authority requires more, the notarised letter is legalised at the Department of Consular Affairs and then, where required, at the destination country's embassy in Bangkok.

For countries party to the Hague Apostille Convention, from 28 February 2027 — the date the Convention enters into force for Thailand — some documents may be accepted with an apostille instead of multi-step legalisation. Until that date, Ministry of Foreign Affairs legalisation remains the route.

What a well-drafted consent letter states

Vague letters invite questions. Letters that officers accept quickly are specific and verifiable. Every name and passport number should match the passport exactly, including middle names and the order of given names and surnames, because officers compare the letter against the passports in front of them.

• The child's full name, date of birth, and passport number.
• The consenting parent's full name, passport or ID number, and address.
• The accompanying adult's name, passport number, and relationship to the child.
• Destination countries, travel dates, and flight numbers if known.
• Accommodation or a contact person at the destination.
• How to reach the consenting parent during the trip.

What to bring on the day of signing

The consenting parent must appear in person with valid identification, because both the registrar and the notary must verify the signer's identity. Bring the ID card or passport, the child's birth certificate, copies of the child's and the companion's passports, and the itinerary. A draft letter checked in advance shortens the appointment considerably.

If one parent holds sole parental authority, bring evidence such as a court judgment, a divorce record stating custody, or the other parent's death certificate. A consent letter may then be unnecessary, but the custody evidence — translated and certified — should travel with the child instead.

If the consenting parent lives abroad, they can sign before a Notary Public where they live or before an official at a Thai embassy or consulate, then courier the original to Thailand. Allow time for authentication and delivery; this is the step families most often underestimate.

Where the parents share authority but disagree about the trip, a consent letter is not the tool. Court orders on travel and custody are a matter for a family lawyer, and we will say so rather than prepare a document that would not resolve the underlying dispute.

At the border: what to keep in your hand luggage

Carry the original consent letter, a copy of the consenting parent's identification, and an English translation of the child's birth certificate in hand luggage, not checked bags. They may be requested both when leaving Thailand and when arriving at the destination, and again on the return journey.

If the child's surname differs from the accompanying adult's, a birth certificate naming the parents explains the relationship immediately. Some countries, Canada among them, officially recommend that adults travelling with children carry a consent letter, and officers may ask the child or adult additional questions.

Photograph or scan every document to your phone, and ask the consenting parent to be reachable on the travel day in case an officer wants to confirm consent by phone. For multi-leg journeys, carry one original and several certified copies.

Airlines set their own rules for unaccompanied minors, including age bands, forms, and who may collect the child on arrival. Those forms are separate from the consent letter; complete both.

How we prepare a notarised consent letter

The sequence below applies when you need an English letter notarised for use abroad.

1. 1. Share the trip details

   Tell us the destination, dates, and companion so we can check for country-specific requirements.

2. 2. Send passport copies

   We need copies for the child, the companion, and the consenting parent.

3. 3. Review the draft

   We draft a bilingual consent for you to check names, numbers, and dates.

4. 4. Sign in person

   The consenting parent signs before the notarial services attorney with original ID.

5. 5. Legalise if required

   We arrange Department of Consular Affairs and embassy legalisation where the destination requires it.

6. 6. Receive the documents

   We hand over the original with scans and guidance on carrying documents on the travel day.

Our role and its limits

We draft bilingual consent letters, check the data, arrange signing before a notarial services attorney, translate birth certificates and custody evidence, and handle Department of Consular Affairs or embassy legalisation when needed.

Notarisation confirms that the person who signed is the person named and signed personally. It does not confirm that the person holds parental authority under the law, and it does not oblige any border authority to allow travel; that decision belongs to officers in each country.

If parental authority is disputed or a parent refuses consent, do not use a consent letter as a workaround. Consult a family lawyer about court proceedings. We coordinate translations and certified copies for those proceedings when asked.

Families who travel often sometimes ask for one letter covering a whole year. Some officers accept that, many do not, and an open-ended consent can create risks of its own. Our default is one letter per trip with explicit dates, which is the version least likely to be questioned.

Frequently asked questions