Yes, you can fly Frontier as a minor, but the rules changed significantly in late 2018 and remain strict in 2026. Frontier Airlines no longer accepts unaccompanied minors under the age of 15. Any child under 15 must be on the same reservation and accompanied by a passenger who is at least 15 years old. For those aged 15 to 17, Frontier allows them to travel alone as "Adult" passengers, though they do not provide a formal escort or supervision service for this age group. If a minor is 15 or older, they must have a valid government-issued photo ID or two forms of non-photo ID. It is a peer-to-peer essential to check the Contract of Carriage if the minor is traveling internationally, as many countries (like Mexico or Canada) require a notarized letter of consent from both parents. For younger children, this "No Unaccompanied Minor" policy means you must plan for an adult to travel with them, making Frontier a "family-together" airline rather than a choice for solo youth travel.