Purpose Thoracic Endovascular Aortic Repair (TEVAR) is the preferred treatment for blunt traumatic aortic injury (BTAI) due to lower morbidity and mortality than open repair. However, long-term outcomes, particularly in the predominantly young BTAI population, remain poorly understood. Ongoing aortic growth and remodelling may affect stent durability and contribute to late complications. This study evaluated long-term aortic remodelling and stent durability following TEVAR for BTAI. Methodology Patients with acute BTAI treated with TEVAR at Waikato Vascular Surgery Department between 2009 and 2026 were retrospectively reviewed. Computed tomography angiography (CTA) was analysed pre-operatively, immediately post-operatively, and at early (1–2 years), mid-term (3–7 years), and late (8–13 years) follow-up. Aortic diameters were measured at the mid-ascending aorta, pre-lesion/stent, peri-lesion/stented, post-lesion/stent, and celiac artery levels. TEVAR-related complications and reinterventions were recorded. Patients without baseline CTA and 30-day deaths were excluded. Results Thirty-five patients were included, with a median age (range) of 31 years (17–78); 80% were male. Four patients (11%) were lost to follow-up. Median follow-up (range) was 31.8 months (1.3–176.2). Grade III injuries accounted for 77% of cases. Aortic diameters increased over time at all sites, with no significant differences in growth between regions (P>0.05). The stented segment demonstrated less diameter increase than non-stented regions. Three TEVAR-related complications required reintervention at 1, 3, and 6 years; all were successfully managed. Conclusions TEVAR demonstrated durable long-term performance and favourable aortic remodelling following BTAI. Similar growth between the healthy and injured segments supports the biomechanical compatibility of TEVAR. Although limited by sample size, these findings suggest reduced surveillance intensity may be feasible in selected patients and warrant investigation in larger studies.