What do kids under 4 need to fly?

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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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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U.S. citizen children traveling abroad If you are traveling alone with your child, you may be required to present documentation proving you are the parent or legal guardian. You may also need a letter of permission from the other parent for your child to travel.

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A birth certificate or passport as proof of the child's age. The adult's government-issued photo ID with their current address. Your phone number so we can contact you. The name, address and phone number of the adult meeting your child at their destination.

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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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Although children who have not reached their second birthday are permitted to travel as lap children, the FAA strongly discourages this practice and recommends that you secure your child in an approved CRS in their own seat for the entire flight.

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16 Tips for Flying With Toddlers and Young Kids
  1. Book an Early Morning Departure. ...
  2. Save Your Upgrades for Toddler-Free Travel. ...
  3. Dress in Layers and Skip Shoes With Laces. ...
  4. Consider Using a Smaller Stroller. ...
  5. Pack Just Enough. ...
  6. Be Prepared for Security. ...
  7. Prepare for Air Pressure Changes. ...
  8. By All Means, Use Pull-Ups.


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YOU WILL NEED TO PURCHASE A TICKET FOR YOUR CHILD IF YOU: Have a child that is 2 years old or older. Have a child that turns 2 during the trip. Prefer the child sit in a seat with an FAA-approved child safety seat. Already have a child that will be sitting in your lap, regardless of age.

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Passport and Photo I.D. Children don't usually need a passport or photo I.D. for domestic flights; however, it's not a bad idea to have photo identification for your children when you travel together. All airlines require the same documentation for children as they would for an adult on international flights.

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Once your child is 2 years old, you'll need to purchase a seat for them. The FAA recommends that children under 40 pounds continue to use a car seat and that children over 40 pounds use the seat belt on the airplane seat.

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Can I take milk on a plane for my toddler? Travel with toddlers on planes, means you still need to think about food and drink for them. And yes, you can still bring milk or water on board for your toddler. It's usually advised to bring water in a sippy cup rather than a normal water bottle.

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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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If you are traveling with a child who is not yours, bring signed and notarized consent forms from the child's parents or legal guardians. Consent form requirements vary by destination, so you may not be asked to produce them, but it's always better to be safe than sorry.

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