What age can a child fly alone on spirit? if you find yourself sending your child alone with Spirit Airlines, understand What age can a child fly alone on spirit? On Spirit Airlines, children aged 5 to 14 years can fly alone using the Unaccompanied Minor (UM) service or For children aged 15 and older, the UM service is not used. for more info read blog- https://tinyurl.com/spirit-airlines-umnr-policy #spiritunaccompaniedminor #spiritunaccompaniedminorage #spiritunaccompaniedminorform #spiritunaccompaniedminorpolicy