| Clausthal-Zellerfeld to Smolyan | 977.51 mi (1,573.14 km) |
| Clausthal-Zellerfeld to Sofia | 873.36 mi (1,405.54 km) |
| Clausthal-Zellerfeld to Sopot | 922.96 mi (1,485.36 km) |
| Clausthal-Zellerfeld to Sozopol | 1,038.30 mi (1,670.99 km) |
| Clausthal-Zellerfeld to Sredets | 1,023.53 mi (1,647.21 km) |
| Clausthal-Zellerfeld to Stamboliyski | 942.71 mi (1,517.14 km) |
| Clausthal-Zellerfeld to Stara Zagora | 964.82 mi (1,552.73 km) |
| Clausthal-Zellerfeld to Svilengrad | 1,017.89 mi (1,638.14 km) |
| Clausthal-Zellerfeld to Svishtov | 895.53 mi (1,441.21 km) |
| Clausthal-Zellerfeld to Targovishte | 957.60 mi (1,541.11 km) |
| Clausthal-Zellerfeld to Teteven | 892.89 mi (1,436.97 km) |
| Clausthal-Zellerfeld to Troyan | 909.86 mi (1,464.28 km) |
| Clausthal-Zellerfeld to Tryavna | 937.73 mi (1,509.14 km) |
| Clausthal-Zellerfeld to Tutrakan | 921.47 mi (1,482.96 km) |
| Clausthal-Zellerfeld to Varna | 1,008.31 mi (1,622.71 km) |
