| Thornton to Smolyan | 1,481.45 mi (2,384.17 km) |
| Thornton to Sofia | 1,377.48 mi (2,216.84 km) |
| Thornton to Sopot | 1,433.33 mi (2,306.72 km) |
| Thornton to Sozopol | 1,557.14 mi (2,505.98 km) |
| Thornton to Sredets | 1,540.80 mi (2,479.68 km) |
| Thornton to Stamboliyski | 1,449.15 mi (2,332.18 km) |
| Thornton to Stara Zagora | 1,477.52 mi (2,377.84 km) |
| Thornton to Svilengrad | 1,529.30 mi (2,461.17 km) |
| Thornton to Svishtov | 1,412.90 mi (2,273.85 km) |
| Thornton to Targovishte | 1,476.79 mi (2,376.66 km) |
| Thornton to Teteven | 1,402.76 mi (2,257.53 km) |
| Thornton to Troyan | 1,421.39 mi (2,287.50 km) |
| Thornton to Tryavna | 1,452.05 mi (2,336.85 km) |
| Thornton to Tutrakan | 1,443.55 mi (2,323.17 km) |
| Thornton to Varna | 1,530.26 mi (2,462.72 km) |
