According to Spirit Airlines, children aged 17 and under are permitted to travel alone as unaccompanied minors. Travelers should have all of the required documents, including identification, birth certificates, and a government-issued personal ID with the parents' contact information. Accepting guests 15 and older who are ready to request assistance, the Spirit unaccompanied minor fee will be charged. Spirit Unaccompanied Minor Policy allows to book a flight,with a call to the carriers directly or set up a flight on the web.