Atrial septal defect is a relatively common congenital heart disease in daily life. Many patients with atrial septal defect often ask if they can fly on planes. This depends on the specific condition. If the atrial septal defect is combined with severe cardiac damage, such as heart failure, then flying is definitely not allowed. However, if the atrial septal defect is mild, not severe, without clinical symptoms or cardiac damage, then it is indeed possible to fly. It is recommended for those in this condition to visit a cardiology outpatient clinic at a hospital and ask a doctor to make an assessment.