| Southlake to Smolyan | 6,100.28 mi (9,817.46 km) |
| Southlake to Sofia | 5,996.19 mi (9,649.94 km) |
| Southlake to Sopot | 6,050.44 mi (9,737.24 km) |
| Southlake to Sozopol | 6,167.21 mi (9,925.16 km) |
| Southlake to Sredets | 6,152.91 mi (9,902.16 km) |
| Southlake to Stamboliyski | 6,067.55 mi (9,764.77 km) |
| Southlake to Stara Zagora | 6,093.49 mi (9,806.52 km) |
| Southlake to Svilengrad | 6,146.06 mi (9,891.13 km) |
| Southlake to Svishtov | 6,024.96 mi (9,696.23 km) |
| Southlake to Targovishte | 6,086.49 mi (9,795.26 km) |
| Southlake to Teteven | 6,020.03 mi (9,688.30 km) |
| Southlake to Troyan | 6,037.93 mi (9,717.11 km) |
| Southlake to Tryavna | 6,066.90 mi (9,763.73 km) |
| Southlake to Tutrakan | 6,048.09 mi (9,733.45 km) |
| Southlake to Varna | 6,134.64 mi (9,872.75 km) |
