The unaccompanied minor fee charged by British Airways is dependent on the routes you select. The cost of the flight ticket will also include the unaccompanied minor fee. You must cover the full cost of the flight, just like an adult, if the child is travelling alone. For short-haul flights inside the UK, British Airways charges a service fee of $50 per segment/child. You must pay British Airways Unaccompanied Minor Fee of $75 each for each segment and each child for long distance routes. When making a reservation for them, the service cost must be paid in full. On certain of its flights, unaccompanied child service is not offered.