| South Riding to Smolyan | 5,038.04 mi (8,107.94 km) |
| South Riding to Sofia | 4,935.63 mi (7,943.12 km) |
| South Riding to Sopot | 4,995.55 mi (8,039.56 km) |
| South Riding to Sozopol | 5,124.01 mi (8,246.29 km) |
| South Riding to Sredets | 5,106.93 mi (8,218.81 km) |
| South Riding to Stamboliyski | 5,008.24 mi (8,059.98 km) |
| South Riding to Stara Zagora | 5,041.07 mi (8,112.81 km) |
| South Riding to Svilengrad | 5,091.58 mi (8,194.10 km) |
| South Riding to Svishtov | 4,979.41 mi (8,013.58 km) |
| South Riding to Targovishte | 5,043.92 mi (8,117.41 km) |
| South Riding to Teteven | 4,964.89 mi (7,990.22 km) |
| South Riding to Troyan | 4,984.50 mi (8,021.78 km) |
| South Riding to Tryavna | 5,016.78 mi (8,073.73 km) |
| South Riding to Tutrakan | 5,011.36 mi (8,065.00 km) |
| South Riding to Varna | 5,098.05 mi (8,204.52 km) |
