How to book an Austrian Airlines unaccompanied minor ticket? Austrian Airlines allows children between 5 and 11 years to fly alone. Austrian Unaccompanied Minor Policy is mandatory for them and optional for the 12 to17 years. To the Austrian 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 the link- https://www.airlinesunaccompaniedminor.com/austrian-airlines-umnr-policy