United Airlines Children 5 to 14 are considered unaccompanied minors unless they have a parent or guardian 18 or older on the same flight. Unaccompanied minor service is not available for children ages 15 and older. Young adults ages 15 to 17 may travel alone on any United- or United Express-operated flight.
Does a 16 year old need a letter to travel?
Is a consent letter recommended even for a day trip? A consent letter is recommended for all cross-border travel, even for a day trip, if the child will be travelling alone, with only one parent, with friends or relatives or with a youth group.