Although a Kommerell diverticulum (KD) and aberrant subclavian artery (ASA) are a common congenital anomaly, a KD and ASA with two thoracic aortic aneurysms are rarely reported. We describe a case of a KD with a right ASA and two thoracic saccular aortic aneurysms, which were treated with a total arch replacement, frozen elephant trunk technique, and thoracic endovascular aortic repair.