How Much is the Fee For Finnair Unaccompanied Minor Service? If you want to book the unaccompanied minor service under the Finnair Unaccompanied Minor Policy, you must pay the full adult fare for your child.The Finnair unaccompanied minor fee for a flight within Finland is $44; within Europe, the flight is $67, and a long-haul flight could be $135. Finnair provides Unaccompanied Minor service for children aged between 5 and 11 years. For more visit their website or call their customer service or read a blog mentioned at link. https://www.airlinesunaccompaniedminor.com/finnair-umnr-policy