| Leiden to Smolyan | 1,195.34 mi (1,923.71 km) |
| Leiden to Sofia | 1,091.26 mi (1,756.21 km) |
| Leiden to Sopot | 1,146.69 mi (1,845.42 km) |
| Leiden to Sozopol | 1,270.74 mi (2,045.06 km) |
| Leiden to Sredets | 1,254.24 mi (2,018.51 km) |
| Leiden to Stamboliyski | 1,162.77 mi (1,871.30 km) |
| Leiden to Stara Zagora | 1,190.83 mi (1,916.45 km) |
| Leiden to Svilengrad | 1,242.65 mi (1,999.84 km) |
| Leiden to Svishtov | 1,126.40 mi (1,812.76 km) |
| Leiden to Targovishte | 1,190.47 mi (1,915.88 km) |
| Leiden to Teteven | 1,116.14 mi (1,796.25 km) |
| Leiden to Troyan | 1,134.71 mi (1,826.14 km) |
| Leiden to Tryavna | 1,165.37 mi (1,875.48 km) |
| Leiden to Tutrakan | 1,157.92 mi (1,863.49 km) |
| Leiden to Varna | 1,244.53 mi (2,002.87 km) |
