What do children need to fly in the US?

Typically, minors under the age of 18 do not have to present identification for domestic U.S. travel. Airlines will accept identification from the responsible adult on behalf of the minor(s). For international travel, minors under the age of 18 must present the same travel documents as the adult.



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Children. TSA does not require children under 18 to provide identification when traveling within the United States.

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Spirit Airlines reserves the right to request documented proof of age for any passenger 2 years of age or younger. You must be prepared to provide documentation (such as the child's birth certificate or passport) upon request.

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Planning your trip
  • Infants on lap. Children under two can sit on a parent's lap during flights to any destination.
  • Infant seats. Alternatively, infants can have their own seat if you bring an approved car seat.
  • All other kids. Children older than two will need a ticket and their own seat on the plane.


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Typically, minors under the age of 18 do not have to present identification for domestic U.S. travel. Airlines will accept identification from the responsible adult on behalf of the minor(s). For international travel, minors under the age of 18 must present the same travel documents as the adult.

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A minor travel consent form is a legal document, signed by a child's parents and/or legal guardians, giving permission for the child to travel with another adult. Any time a child travels abroad without both parents and/or legal guardians, they need to have this written permission.

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You'll need to fill out an unaccompanied minor form and any necessary Customs and Immigration documents for the day of departure. This form must remain with your child during their journey. At check-in, parents / guardians will also need to provide: A birth certificate or passport as proof of the child's age.

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Typically, minors under the age of 18 do not have to present identification for domestic U.S. travel. Airlines will accept identification from the responsible adult on behalf of the minor(s). For international travel, minors under the age of 18 must present the same travel documents as the adult.

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It is worth noting that lap infants are not entitled to their own carry-on luggage, and any diaper bags will be counted against the adult's baggage limit. However, car seats and strollers can be checked for free.

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Remember: You can bring one personal item and bring items like an umbrella, camera, infant diaper bag, assistive devices, outer garments (e.g., coats, hats and wraps), reading material and food for the flight for no additional charge.

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A child under two years old (24 months) can travel for free as long as the infant will be on the lap of another passenger for the flight.

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Beginning May 7, 2025, every air traveler 18 years of age and older will need a REAL ID-compliant driver's license, state-issued enhanced driver's license, or another acceptable form of ID to fly within the United States.

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Travel Documents and Information
  1. Valid photo identification. ...
  2. Travel tickets (plane, train, bus; can be paper or electronic copies)
  3. Boarding passes.
  4. Reservation confirmations (rental car, hotel, pre-paid tickets for events; can be paper or electronic copies)
  5. Credit and debit cards. ...
  6. Cash.
  7. Emergency contact list.


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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.

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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.

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Most U.S. airlines will permit children who have reached their fifth birthday to travel unaccompanied. Kids ages 5 through 11 who are flying alone must usually travel pursuant to special “unaccompanied minor” procedures. On some airlines, these procedures are required for unaccompanied children as old as 14.

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A Child Travel Consent is sometimes called a letter of permission to travel. A Child Travel Consent essentially proves to the transportation providers and Custom Officers that both parents or legal guardians give the child authorization to travel by providing their signatures.

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