| Alcala la Real to Smolyan | 1,544.42 mi (2,485.51 km) |
| Alcala la Real to Sofia | 1,478.46 mi (2,379.34 km) |
| Alcala la Real to Sopot | 1,550.12 mi (2,494.67 km) |
| Alcala la Real to Sozopol | 1,699.53 mi (2,735.12 km) |
| Alcala la Real to Sredets | 1,673.92 mi (2,693.92 km) |
| Alcala la Real to Stamboliyski | 1,537.10 mi (2,473.73 km) |
| Alcala la Real to Stara Zagora | 1,595.06 mi (2,567.00 km) |
| Alcala la Real to Svilengrad | 1,622.02 mi (2,610.38 km) |
| Alcala la Real to Svishtov | 1,585.66 mi (2,551.87 km) |
| Alcala la Real to Targovishte | 1,645.31 mi (2,647.87 km) |
| Alcala la Real to Teteven | 1,527.04 mi (2,457.53 km) |
| Alcala la Real to Troyan | 1,549.56 mi (2,493.78 km) |
| Alcala la Real to Tryavna | 1,589.05 mi (2,557.33 km) |
| Alcala la Real to Tutrakan | 1,651.36 mi (2,657.61 km) |
| Alcala la Real to Varna | 1,712.21 mi (2,755.53 km) |
