Children aged 5 to 11 can fly solo with Southwest, while those 12 and older are classified as Young Travelers and do not require this service. Southwest Airlines charges $100 each way for unaccompanied minors (UMs) ages 5–11. Southwest Unaccompanied Minor fee is optional and includes services such as escorts and a lanyard to help the minor get assistance. Understanding the minor fee for unaccompanied passengers is essential when traveling with young passengers wcho need extra care.