To travel as a Spirit Airlines unaccompanied minor, your kid must be between 5 and 14 years of age. The airline accepts them onboard when no adult is traveling with them, who is 15 years old or more. Unaccompanied minors can travel to domestic destinations on direct flights. However, if the trip includes a connecting flight or an aircraft change, unaccompanied minors are not allowed onboard. They also get drinks and snacks, and stay entertained and engaged throughout the flight.