What to carry
- A consent letter signed by the parent or parents who aren't travelling, with their contact details and the dates of the trip.
- Proof of your link to the child if your surnames are different, such as a birth or adoption certificate.
- Copies of any custody or court orders, if relevant.
A consent letter isn't always a legal requirement, but it can save a long wait at the border. Some countries have stricter rules for children who are also their citizens.
Country by country
Schengen area
Carry a consent letter for the child. Each Schengen country sets its own rules, and airlines may ask too. Carry a letter signed by any parent who isn't travelling. Portugal requires a certified letter if a child travels alone or with an adult who isn't their parent. Official guidance
Ireland
Bring proof of consent for the child. If a child travels with one parent, or with an adult who isn't their parent, an immigration officer may ask for proof. It isn't compulsory, but it helps to bring a signed consent letter from the other parent with their contact details, a copy of their passport or driving licence, and the child's birth or adoption certificate. Official guidance
United Kingdom
Carry proof of your link to the child. If you don't seem to be the child's parent, for example you have a different surname, Border Force may ask you to prove your relationship. Bring a birth or adoption certificate, or a marriage or divorce certificate. If you're not a parent, bring a letter from a parent giving permission, with their contact details. Official guidance
United States
Carry a consent letter for your child. If a child is travelling alone, with only one parent or with someone else, carry a letter of consent from the parent or parents not travelling. It should be in English and preferably notarised. It can say: "I acknowledge that my child is travelling outside the country with [name of adult] with my permission." Official guidance
Canada
Carry a consent letter for your child. If you're travelling with a child under 18 and the other parent or guardian isn't with you, or you're not the child's parent or guardian, carry a consent letter. It must give the parents' or guardians' full names, addresses and phone numbers. Having it notarised helps avoid delays. Bring copies of any custody papers too. Official guidance
Mexico
Carry proof you can travel with your child. Children who are Mexican citizens or live in Mexico need a consent form (Formato SAM) or a notarised consent letter to leave Mexico without both parents. For other children, officials may ask for a birth certificate and a consent letter from any parent who isn't there. Get the letter notarised, and translated into Spanish if the child travels without either parent. Official guidance
Turkey
Bring the Turkish parent's permission. If you leave Turkey with a child who is also a Turkish citizen, officials may ask to see that the Turkish parent agrees to the trip. Carry written permission from them.
Checked 26 October 2026 against European Union, GOV.UK, Government of Canada, Department of Foreign Affairs, Immigration Service Delivery, Department of Justice, Home Affairs and Migration, USAGov, Department of Foreign Affairs, Ireland, SafeTravel, Canada Border Services Agency, Immigration, Refugees and Citizenship Canada, US Embassy and Consulates in Canada, Instituto Nacional de Migración and US Department of State.
See the 22 official sources
- Documents for minors travelling in the EU (European Union (Your Europe))
- Portugal entry requirements (GOV.UK (Foreign, Commonwealth and Development Office))
- Consent letter for children travelling outside Canada (Government of Canada)
- France travel advice (Department of Foreign Affairs (Ireland))
- Travelling with children (Immigration Service Delivery, Department of Justice, Home Affairs and Migration)
- Entering the UK: before you leave for the UK (GOV.UK (Border Force))
- Travel documents for children (USAGov)
- USA entry requirements (GOV.UK (Foreign, Commonwealth and Development Office))
- United States of America (USA) travel advice (Department of Foreign Affairs, Ireland)
- United States of America (SafeTravel (New Zealand Ministry of Foreign Affairs and Trade))
- Travel documents for entering Canada (Canada Border Services Agency)
- eTA: what to do after you apply (Immigration, Refugees and Citizenship Canada)
- Canada entry requirements (GOV.UK (Foreign, Commonwealth and Development Office))
- U.S. citizens visiting Canada (US Embassy and Consulates in Canada (US Department of State))
- Portal de Servicios del INM (Instituto Nacional de Migración (INM))
- Mexico travel advice and advisories (Government of Canada)
- Mexico entry requirements (GOV.UK)
- Mexico International Travel Information (US Department of State)
- Mexico travel advice (Department of Foreign Affairs, Ireland)
- Turkey entry requirements (GOV.UK)
- Türkiye travel advice (Department of Foreign Affairs, Ireland)
- Türkiye travel advice and advisories (Government of Canada)