| San Lorenzo de El Escorial to Smolyan | 1,496.56 mi (2,408.48 km) |
| San Lorenzo de El Escorial to Sofia | 1,419.57 mi (2,284.58 km) |
| San Lorenzo de El Escorial to Sopot | 1,491.77 mi (2,400.77 km) |
| San Lorenzo de El Escorial to Sozopol | 1,642.81 mi (2,643.84 km) |
| San Lorenzo de El Escorial to Sredets | 1,617.96 mi (2,603.86 km) |
| San Lorenzo de El Escorial to Stamboliyski | 1,483.85 mi (2,388.03 km) |
| San Lorenzo de El Escorial to Stara Zagora | 1,538.70 mi (2,476.29 km) |
| San Lorenzo de El Escorial to Svilengrad | 1,571.79 mi (2,529.56 km) |
| San Lorenzo de El Escorial to Svishtov | 1,518.07 mi (2,443.10 km) |
| San Lorenzo de El Escorial to Targovishte | 1,581.24 mi (2,544.76 km) |
| San Lorenzo de El Escorial to Teteven | 1,466.06 mi (2,359.40 km) |
| San Lorenzo de El Escorial to Troyan | 1,488.94 mi (2,396.21 km) |
| San Lorenzo de El Escorial to Tryavna | 1,528.58 mi (2,460.01 km) |
| San Lorenzo de El Escorial to Tutrakan | 1,580.02 mi (2,542.79 km) |
| San Lorenzo de El Escorial to Varna | 1,648.34 mi (2,652.75 km) |
