| Alpen to Smolyan | 1,100.51 mi (1,771.09 km) |
| Alpen to Sofia | 996.38 mi (1,603.52 km) |
| Alpen to Sopot | 1,051.52 mi (1,692.25 km) |
| Alpen to Sozopol | 1,175.50 mi (1,891.78 km) |
| Alpen to Sredets | 1,158.97 mi (1,865.18 km) |
| Alpen to Stamboliyski | 1,067.78 mi (1,718.43 km) |
| Alpen to Stara Zagora | 1,095.59 mi (1,763.18 km) |
| Alpen to Svilengrad | 1,147.45 mi (1,846.65 km) |
| Alpen to Svishtov | 1,031.13 mi (1,659.44 km) |
| Alpen to Targovishte | 1,095.25 mi (1,762.64 km) |
| Alpen to Teteven | 1,020.98 mi (1,643.11 km) |
| Alpen to Troyan | 1,039.50 mi (1,672.91 km) |
| Alpen to Tryavna | 1,070.10 mi (1,722.15 km) |
| Alpen to Tutrakan | 1,062.91 mi (1,710.59 km) |
| Alpen to Varna | 1,149.48 mi (1,849.91 km) |
