According to Frontier Airlines' travel policies, children between the ages of 5 and 14 are considered unaccompanied minors when travelling without a companion who is at least 15 years old. Frontier Airlines unaccompanied minor service to assist these children every step of the way. However, effective November 1, 2018, Frontier Airlines does not allow unaccompanied minors under the age of 15. Any child under the age of 15 must be on the same reservation as an accompanying adult who is over the age of 13.