Want to know the charges of Southwest Airline unaccompanied minors flights? Southwest Airlines' special unaccompanied minor services allow minors to travel alone. Every child under the age of 14 is required to apply for the programme for unaccompanied minors. To use this, parents must pay the cost of an adult fare plus the Southwest Airlines Unaccompanied Minor Fee for extra services such as meals and pre-boarding to allow children to settle conveniently.