| Os to Smolyan | 1,523.96 mi (2,452.58 km) |
| Os to Sofia | 1,423.99 mi (2,291.69 km) |
| Os to Sopot | 1,459.10 mi (2,348.20 km) |
| Os to Sozopol | 1,544.62 mi (2,485.83 km) |
| Os to Sredets | 1,536.14 mi (2,472.18 km) |
| Os to Stamboliyski | 1,486.05 mi (2,391.56 km) |
| Os to Stara Zagora | 1,493.47 mi (2,403.51 km) |
| Os to Svilengrad | 1,547.35 mi (2,490.22 km) |
| Os to Svishtov | 1,414.28 mi (2,276.07 km) |
| Os to Targovishte | 1,466.62 mi (2,360.29 km) |
| Os to Teteven | 1,431.56 mi (2,303.88 km) |
| Os to Troyan | 1,443.99 mi (2,323.88 km) |
| Os to Tryavna | 1,463.43 mi (2,355.16 km) |
| Os to Tutrakan | 1,419.65 mi (2,284.71 km) |
| Os to Varna | 1,502.36 mi (2,417.82 km) |
