How can I add my child's ticket to an existing flight booking? Unfortunately, a child cannot be added to an existing booking. You will need to book a separate ticket for your child with the airline directly. Did you find this article helpful?

Yes, you can add a child to an existing flight booking, but the process and cost vary significantly depending on the airline and the child's age. For an infant (under 2 years old) who will be a "lap child," you can usually call the airline or use the "Manage Booking" tool to add them for a small fee (often 10% of the adult fare plus taxes on international routes, or free on domestic U.S. flights). For a child who requires their own seat (usually 2 to 12 years old), you cannot simply "add" them to your existing ticket; instead, a new reservation must be made at the current market price. Once the child's ticket is booked, you must call the airline to have the two reservations "linked" or "cross-referenced" so the staff knows you are traveling together. In 2026, some budget carriers like Frontier or Spirit require you to speak with a "Customer Care" agent to process these changes, as they cannot be done online for security reasons. It is vital to do this as soon as possible, as many airlines have a limit on the number of infants allowed in a single cabin for safety reasons, and you will want to ensure you can secure a seat assignment next to your child to comply with modern 2026 "family seating" regulations.