| Alken to Sofia | 1,018.54 mi (1,639.19 km) |
| Alken to Sopot | 1,076.61 mi (1,732.64 km) |
| Alken to Sozopol | 1,205.47 mi (1,940.01 km) |
| Alken to Sredets | 1,187.85 mi (1,911.67 km) |
| Alken to Stamboliyski | 1,090.72 mi (1,755.35 km) |
| Alken to Stara Zagora | 1,121.81 mi (1,805.37 km) |
| Alken to Svilengrad | 1,172.69 mi (1,887.26 km) |
| Alken to Svishtov | 1,060.70 mi (1,707.03 km) |
| Alken to Targovishte | 1,125.85 mi (1,811.88 km) |
| Alken to Teteven | 1,045.96 mi (1,683.31 km) |
| Alken to Troyan | 1,065.31 mi (1,714.45 km) |
| Alken to Tryavna | 1,097.42 mi (1,766.13 km) |
| Alken to Tutrakan | 1,096.19 mi (1,764.15 km) |
| Alken to Varna | 1,182.23 mi (1,902.62 km) |
| Alken to Veliki Preslav | 1,138.78 mi (1,832.69 km) |
