Yes, a 1-year-old can fly internationally, but they must have their own valid passport, regardless of age. In 2026, most countries have moved away from allowing children to be listed on a parent's passport. If only one parent is traveling with the infant, many jurisdictions and airlines (such as those in the Schengen Area or Canada) strongly recommend or require a notarized consent letter from the non-traveling parent to prevent international child abduction. Health-wise, ensure the infant has received their baseline vaccinations; some tropical destinations may require specific shots that are only administered after 6–12 months of age. While infants under two can fly as a "lap child" for a fraction of the adult fare (usually 10% plus taxes), for long-haul international flights, it is often safer and more comfortable to book a separate seat and use an FAA-approved car seat. Always bring the original birth certificate as backup proof of age.