| Iserlohn to Smolyan | 1,051.52 mi (1,692.25 km) |
| Iserlohn to Sofia | 947.31 mi (1,524.55 km) |
| Iserlohn to Sopot | 1,001.77 mi (1,612.20 km) |
| Iserlohn to Sozopol | 1,124.87 mi (1,810.31 km) |
| Iserlohn to Sredets | 1,108.51 mi (1,783.97 km) |
| Iserlohn to Stamboliyski | 1,018.49 mi (1,639.10 km) |
| Iserlohn to Stara Zagora | 1,045.61 mi (1,682.75 km) |
| Iserlohn to Svilengrad | 1,097.64 mi (1,766.48 km) |
| Iserlohn to Svishtov | 980.60 mi (1,578.13 km) |
| Iserlohn to Targovishte | 1,044.56 mi (1,681.06 km) |
| Iserlohn to Teteven | 971.27 mi (1,563.12 km) |
| Iserlohn to Troyan | 989.62 mi (1,592.64 km) |
| Iserlohn to Tryavna | 1,019.92 mi (1,641.41 km) |
| Iserlohn to Tutrakan | 1,011.90 mi (1,628.49 km) |
| Iserlohn to Varna | 1,098.50 mi (1,767.87 km) |
