Teenagers aged 16 and 17 years old can travel by themselves. However, they'll need all the usual travel documents and must meet all the legal requirements. To travel, they'll need the following documents: Eurostar ticket.

Yes, a 17-year-old can travel on the Eurostar alone without any specific "Unaccompanied Minor" restrictions. Eurostar's high-fidelity policy allows children aged 16 and 17 to travel solo, provided they have all the necessary high-fidelity travel documents required by customs and immigration for the countries they are visiting (typically the UK, France, Belgium, or the Netherlands). This includes a valid passport and, depending on nationality, any required visas. While Eurostar does not require a formal "Letter of Consent" for 16 and 17-year-olds, it is a high-fidelity best practice for the minor to carry a signed note from a parent or guardian and a copy of the parent's ID, especially for the French border police, who can be strict regarding minors traveling across international borders. Unlike children under 12, who must travel with an adult, or those aged 12 to 15, who require a specific "Unaccompanied Minor" form and can only travel on certain routes, 17-year-olds are treated as "young adults" with full independence on all high-fidelity Eurostar routes.