- Babies and children between 0 and 7 years of agemust always travel with an adult over the age of 18. Minimum age for flying alone: Virgin Atlantic allows children between the ages of 5-12 years to travel alone if they fill out the Unaccompanied minors form and have it signed by their parents or legal guardians. Booking your child's trip Unaccompanied minors need to be booked by phone. Children between 12 and 17 years of age can fly alone domestically without restrictions, but flying internationally requires that the child meets certain protocols. Babies, children and teenagers may travel unaccompanied or with a responsible adult, depending on their age. Yes, you can book a reservation for an unaccompanied minor through a travel agency. Children from 5 to 7 can travel alone on nonstop flights, while children between 8 and 11 can fly alone on any flight, with certain restrictions, such as the size of the airplane. However, once you've purchased the ticket, you or your travel agent will need to call the United Customer Contact Center so that a United representative can add the required travel information to your child's reservation and collect the service charge payment. Note: Children ages 2 – 14 can travel as an 'accompanied minor' with someone 16 or older. Children under 5 years old cannot fly alone, they must be accompanied by someone 16 …