| Sundern to Smolyan | 1,037.00 mi (1,668.88 km) |
| Sundern to Sofia | 932.77 mi (1,501.15 km) |
| Sundern to Sopot | 987.05 mi (1,588.50 km) |
| Sundern to Sozopol | 1,109.92 mi (1,786.24 km) |
| Sundern to Sredets | 1,093.59 mi (1,759.97 km) |
| Sundern to Stamboliyski | 1,003.89 mi (1,615.60 km) |
| Sundern to Stara Zagora | 1,030.82 mi (1,658.95 km) |
| Sundern to Svilengrad | 1,082.90 mi (1,742.75 km) |
| Sundern to Svishtov | 965.68 mi (1,554.11 km) |
| Sundern to Targovishte | 1,029.59 mi (1,656.96 km) |
| Sundern to Teteven | 956.56 mi (1,539.44 km) |
| Sundern to Troyan | 974.86 mi (1,568.88 km) |
| Sundern to Tryavna | 1,005.08 mi (1,617.53 km) |
| Sundern to Tutrakan | 996.86 mi (1,604.28 km) |
| Sundern to Varna | 1,083.47 mi (1,743.68 km) |
