United Airlines allows children aged 5-14 to fly alone, but for children 15 and older, solo travel is allowed without any special requirements. If your 14-year-old is flying, the United Airlines Unaccompanied Minor Policy makes the minor service optional. This means your 14-year-old can travel alone without needing to enroll in the program, although parents may still choose to book the service for added assistance. The service includes extra supervision during check-in and boarding and at the destination airport.