The minimum age for a child to travel alone by airline, but most U.S. airlines allow children as young as 5 years old to fly with an unaccompanied minor policy, which provides supervision and assistance during the destination. For international travel, some airlines require children to be at least 6 or 8 years old to use this kind of service. Without it, many airlines set the minimum solo travel age between 12 and 15 years old. If you're wondering what is the youngest age to fly alone, it's always best to check the airline’s specific policies before booking.Need any help then let me know.