If you’re under 18 and traveling internationally without one or both of your parents, many countries may want proof that the absent parent is okay with the trip. The way you typically show that is with a notarized letter of consent — basically a signed statement from the parent who’s staying home that says, yes, I know about this trip, and yes, I approve.
Border agents take this seriously. The whole reason the requirement exists is to help prevent international child abduction. So if you show up without the letter, you could be turned away at the destination country’s border — even if you have a valid passport.
According to USAGov, the letter should ideally be in English and notarized. “Notarized” just means a licensed notary public has officially verified the signature — your bank, library, or UPS store often offers this service for free or cheap.
This can apply in a few different situations: if you’re traveling with just one parent, if you’re traveling with a grandparent or other adult who isn’t your guardian, or if you’re traveling alone. The U.S. Department of State notes that the U.S. itself doesn’t require this documentation for leaving the country — but some destination countries do. So even if you board the flight fine, you could hit a wall when you land.
Every country has its own rules, so check the specific requirements for wherever you’re going before you leave. But as a general rule: if both parents aren’t physically on the trip with you, getting the letter is a smart move. It’s a small hassle compared to being stuck at a border checkpoint.