| Altena to Smolyan | 1,048.36 mi (1,687.17 km) |
| Altena to Sofia | 944.17 mi (1,519.50 km) |
| Altena to Sopot | 998.88 mi (1,607.54 km) |
| Altena to Sozopol | 1,122.40 mi (1,806.33 km) |
| Altena to Sredets | 1,105.94 mi (1,779.84 km) |
| Altena to Stamboliyski | 1,015.43 mi (1,634.18 km) |
| Altena to Stara Zagora | 1,042.81 mi (1,678.24 km) |
| Altena to Svilengrad | 1,094.78 mi (1,761.87 km) |
| Altena to Svishtov | 978.07 mi (1,574.06 km) |
| Altena to Targovishte | 1,042.13 mi (1,677.14 km) |
| Altena to Teteven | 968.36 mi (1,558.43 km) |
| Altena to Troyan | 986.78 mi (1,588.07 km) |
| Altena to Tryavna | 1,017.21 mi (1,637.04 km) |
| Altena to Tutrakan | 1,009.70 mi (1,624.95 km) |
| Altena to Varna | 1,096.27 mi (1,764.28 km) |
