Kids under 2 years old can travel as an infant with their parent’s lap. Moreover, children 2 to 12 years old are considered minors, but the age limit for traveling on airlines is 5 to 12 years old and is the ability to fly alone. Additionally, airlines offer fare discounts and more for flying as an unaccompanied minor. To learn more about flight age limits, visit the Airlinesunaccompaniedminor website.