| Hildburghausen to Smolyan | 903.27 mi (1,453.67 km) |
| Hildburghausen to Sofia | 798.99 mi (1,285.84 km) |
| Hildburghausen to Sopot | 852.45 mi (1,371.89 km) |
| Hildburghausen to Sozopol | 974.85 mi (1,568.87 km) |
| Hildburghausen to Sredets | 958.53 mi (1,542.61 km) |
| Hildburghausen to Stamboliyski | 869.79 mi (1,399.79 km) |
| Hildburghausen to Stara Zagora | 896.01 mi (1,441.98 km) |
| Hildburghausen to Svilengrad | 948.22 mi (1,526.01 km) |
| Hildburghausen to Svishtov | 830.61 mi (1,336.74 km) |
| Hildburghausen to Targovishte | 894.54 mi (1,439.62 km) |
| Hildburghausen to Teteven | 822.01 mi (1,322.89 km) |
| Hildburghausen to Troyan | 840.14 mi (1,352.07 km) |
| Hildburghausen to Tryavna | 870.14 mi (1,400.36 km) |
| Hildburghausen to Tutrakan | 862.06 mi (1,387.35 km) |
| Hildburghausen to Varna | 948.62 mi (1,526.65 km) |
