Children under 18 don't need an ID to fly domestically but do need a passport for international flights. You can also bring breast milk or formula through security, even if your child isn't with you. But, be sure you meet TSA guidelines.
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If you're flying to Canada, you need a passport. No exceptions. If you're crossing a land or sea border, a birth certificate that establishes citizenship is sufficient for citizens under 16.
Young Travellers:For travellers younger than 18, an original birth certificate or non-government issued ID (e.g. a student card) is suggested but not mandatory, unless our Unaccompanied Minor Service is used. * Fishing, hunting and boating licenses are no longer accepted as identification for domestic flights.
If just traveling with friends or family, 16–18-year-olds will need a passport - as will all other U.S. and Canadian citizens over the age of 15. If traveling by air, an unexpired Passport is required for everyone, including infants.
All children, including infants, must have their own passport or Trusted Traveler Program document for U.S. entry. Carry documents for traveling with minor children. If you are escorting a minor child without the parents, have a letter from both parents indicating that you have permission to travel with the minor.
Unless your child already has a passport that can be used to prove their birth date, you may need to bring a copy of their birth certificate. While some airlines are more lenient than others, it's always best to come prepared.
International Travel. Regardless of age, all children need a valid passport for air travel to another country. The application process for children under the age of 16 needs to be completed in person.
United States Customs and Border Protection (CBP) requests written consent from both parents or the parent who is not accompanying the minor for minors (those less than 18 years of age) traveling to the U.S. alone or accompanied by only one parent. This written consent must be in English.
Expired passports cannot be used to travel from the U.S. to an international destination or to travel to a foreign country for any length of stay longer than an airport connection en route to the U.S. or to a U.S. territory.