Children aged 15 and under must possess a valid passport when traveling to Northern Ireland. An Irish passport card issued in the child's own name is also accepted, though these cards expire on 1 October 2025.
Children under 16 are not legally required to carry photographic identification. However, individual airlines may request proof of identity—such as a birth certificate—if the child's name appears on the boarding pass. It is always advisable to check with the specific carrier before travel.