| Calahorra to Smolyan | 1,365.77 mi (2,198.00 km) |
| Calahorra to Sofia | 1,284.10 mi (2,066.56 km) |
| Calahorra to Sopot | 1,356.04 mi (2,182.34 km) |
| Calahorra to Sozopol | 1,506.91 mi (2,425.13 km) |
| Calahorra to Sredets | 1,482.55 mi (2,385.93 km) |
| Calahorra to Stamboliyski | 1,350.57 mi (2,173.53 km) |
| Calahorra to Stara Zagora | 1,403.58 mi (2,258.84 km) |
| Calahorra to Svilengrad | 1,439.35 mi (2,316.41 km) |
| Calahorra to Svishtov | 1,378.05 mi (2,217.75 km) |
| Calahorra to Targovishte | 1,442.39 mi (2,321.31 km) |
| Calahorra to Teteven | 1,329.30 mi (2,139.30 km) |
| Calahorra to Troyan | 1,352.19 mi (2,176.13 km) |
| Calahorra to Tryavna | 1,391.65 mi (2,239.64 km) |
| Calahorra to Tutrakan | 1,438.06 mi (2,314.33 km) |
| Calahorra to Varna | 1,509.23 mi (2,428.87 km) |
