| Slagelse to Smolyan | 1,129.49 mi (1,817.73 km) |
| Slagelse to Sofia | 1,028.62 mi (1,655.41 km) |
| Slagelse to Sopot | 1,066.06 mi (1,715.65 km) |
| Slagelse to Sozopol | 1,158.68 mi (1,864.72 km) |
| Slagelse to Sredets | 1,148.55 mi (1,848.42 km) |
| Slagelse to Stamboliyski | 1,091.92 mi (1,757.27 km) |
| Slagelse to Stara Zagora | 1,102.02 mi (1,773.53 km) |
| Slagelse to Svilengrad | 1,156.02 mi (1,860.43 km) |
| Slagelse to Svishtov | 1,024.42 mi (1,648.64 km) |
| Slagelse to Targovishte | 1,079.40 mi (1,737.13 km) |
| Slagelse to Teteven | 1,037.95 mi (1,670.43 km) |
| Slagelse to Troyan | 1,051.23 mi (1,691.79 km) |
| Slagelse to Tryavna | 1,072.41 mi (1,725.88 km) |
| Slagelse to Tutrakan | 1,034.78 mi (1,665.32 km) |
| Slagelse to Varna | 1,119.37 mi (1,801.46 km) |
