Children between the ages of 2-4 are also allowed to fly with Volaris, but only if they are accompanied by a family member (ages 13-17). Volaris Minor Travelling Alone Service is only available to children ages 2-4 when they are travelling with a family member who is between the ages of 13 and 17. The age requirement to board a Volaris flight is 18.
https://airlinespolicy.com/una....ccompanied-minors/vo