One airline may charge by the child, while another may let siblings fly together by paying only one fee. One may allow kids to take connecting itineraries, while another may only permit unaccompanied minors to fly on non-stop or direct flights.

While the vast majority of major commercial airlines in 2026—including Delta, American, and United—charge a mandatory fee for their unaccompanied minor (UMNR) service, it is not a universal rule across all carriers. Low-cost carriers and some international airlines have different policies; for example, some budget airlines (like Southwest or certain European LCCs) may have lower fees or restrict the service entirely for certain age groups. Typically, the fee covers the cost of a dedicated staff member to supervise the child during the flight and through airport transitions. In 2026, these fees usually range from $50 to $150 per direction, on top of the ticket price. However, some boutique or smaller regional airlines might not offer a formal "UMNR program" at all, instead requiring children under a certain age to be accompanied by an adult, while older teens might fly as regular passengers without an extra fee. Always check the specific "Contract of Carriage" for your airline to see if they waive the fee for siblings or have specific exceptions.