Child Ticket Age and Price Most airlines count any person between the ages of 2—11 as a child. You're required to purchase a seat for children, although in most cases they're considerably cheaper than the price of an adult ticket (between 25—33% cheaper).

Airline pricing for children typically falls into three categories: infants, children, and adults. Infants under the age of two traveling as "lap children" on domestic flights within the United States are generally free, though they still require a boarding pass. On international flights, lap infants are usually charged roughly 10% of the adult fare plus applicable taxes and fees. Once a child turns two, they are legally required to have their own seat. While some international carriers offer a "child fare" (typically 75% to 85% of the adult price for kids aged 2–11), most domestic U.S. airlines charge the full adult price for any child over two. Beyond the base ticket price, you should also consider ancillary fees: while many airlines provide one or two checked bags for children for free (such as strollers or car seats), they may charge for standard luggage just as they would for an adult. It is worth noting that some European "low-cost" carriers like Ryanair or EasyJet have a flat "infant fee" (around €25–€30) regardless of the adult ticket price. Always check the "Manage Booking" section of the airline's website, as these policies can vary significantly based on your specific route and frequent flyer status.