If you're sending your child on a solo flight with Southwest, you may be thinking of the costs for unaccompanied minor services. Southwest Airlines charges a small fee for children ages 5-11 who are flying alone. This fee is part of the Southwest Minor Policy, which makes sure that your child receives priority boarding, dedicated flight attendants, and assistance during the entire journey. For older children ages 12 and up, no unaccompanied minor fee is required, though the airline still provides guidelines for safe travel.