What is Delta Airlines unaccompanied minor policy? Passengers, Do you have children that need to fly? Delta Airlines Unaccompanied Minor policy allows younger children (typically age 5 and older) to safely fly by themselves and can cost around $150. If you have any issues related to the Delta UMNR flights then you can get in touch with their customer service team and get answers or visit their website or read the blog mentioned at link. https://www.articleted.com/article/836398/289272/Delta-Airlines-Unaccompanied-Minor---A-Comprehensive-Guide