| Frondenberg to Smolyan | 1,051.36 mi (1,692.00 km) |
| Frondenberg to Sofia | 947.12 mi (1,524.24 km) |
| Frondenberg to Sopot | 1,001.21 mi (1,611.30 km) |
| Frondenberg to Sozopol | 1,123.69 mi (1,808.40 km) |
| Frondenberg to Sredets | 1,107.46 mi (1,782.29 km) |
| Frondenberg to Stamboliyski | 1,018.18 mi (1,638.60 km) |
| Frondenberg to Stara Zagora | 1,044.90 mi (1,681.61 km) |
| Frondenberg to Svilengrad | 1,097.03 mi (1,765.50 km) |
| Frondenberg to Svishtov | 979.51 mi (1,576.38 km) |
| Frondenberg to Targovishte | 1,043.32 mi (1,679.07 km) |
| Frondenberg to Teteven | 970.74 mi (1,562.26 km) |
| Frondenberg to Troyan | 988.98 mi (1,591.61 km) |
| Frondenberg to Tryavna | 1,019.09 mi (1,640.07 km) |
| Frondenberg to Tutrakan | 1,010.34 mi (1,625.99 km) |
| Frondenberg to Varna | 1,096.99 mi (1,765.44 km) |
