| Ostwald to Smolyan | 955.48 mi (1,537.70 km) |
| Ostwald to Sofia | 853.81 mi (1,374.07 km) |
| Ostwald to Sopot | 916.23 mi (1,474.52 km) |
| Ostwald to Sozopol | 1,052.85 mi (1,694.40 km) |
| Ostwald to Sredets | 1,033.31 mi (1,662.96 km) |
| Ostwald to Stamboliyski | 926.59 mi (1,491.20 km) |
| Ostwald to Stara Zagora | 962.97 mi (1,549.75 km) |
| Ostwald to Svilengrad | 1,011.71 mi (1,628.20 km) |
| Ostwald to Svishtov | 908.73 mi (1,462.46 km) |
| Ostwald to Targovishte | 975.21 mi (1,569.45 km) |
| Ostwald to Teteven | 885.68 mi (1,425.36 km) |
| Ostwald to Troyan | 906.28 mi (1,458.52 km) |
| Ostwald to Tryavna | 940.82 mi (1,514.10 km) |
| Ostwald to Tutrakan | 951.45 mi (1,531.22 km) |
| Ostwald to Varna | 1,035.44 mi (1,666.38 km) |
