| Alsdorf to Smolyan | 1,089.29 mi (1,753.04 km) |
| Alsdorf to Sofia | 985.56 mi (1,586.11 km) |
| Alsdorf to Sopot | 1,042.91 mi (1,678.39 km) |
| Alsdorf to Sozopol | 1,170.67 mi (1,884.02 km) |
| Alsdorf to Sredets | 1,153.29 mi (1,856.04 km) |
| Alsdorf to Stamboliyski | 1,057.57 mi (1,701.99 km) |
| Alsdorf to Stara Zagora | 1,087.84 mi (1,750.71 km) |
| Alsdorf to Svilengrad | 1,138.98 mi (1,833.01 km) |
| Alsdorf to Svishtov | 1,025.95 mi (1,651.10 km) |
| Alsdorf to Targovishte | 1,090.90 mi (1,755.63 km) |
| Alsdorf to Teteven | 1,012.27 mi (1,629.09 km) |
| Alsdorf to Troyan | 1,031.42 mi (1,659.91 km) |
| Alsdorf to Tryavna | 1,063.19 mi (1,711.04 km) |
| Alsdorf to Tutrakan | 1,060.70 mi (1,707.03 km) |
| Alsdorf to Varna | 1,146.86 mi (1,845.69 km) |
