| Santander to Smolyan | 1,450.21 mi (2,333.89 km) |
| Santander to Sofia | 1,364.31 mi (2,195.64 km) |
| Santander to Sopot | 1,435.62 mi (2,310.41 km) |
| Santander to Sozopol | 1,585.68 mi (2,551.90 km) |
| Santander to Sredets | 1,561.92 mi (2,513.67 km) |
| Santander to Stamboliyski | 1,432.67 mi (2,305.66 km) |
| Santander to Stara Zagora | 1,483.59 mi (2,387.61 km) |
| Santander to Svilengrad | 1,521.90 mi (2,449.25 km) |
| Santander to Svishtov | 1,452.71 mi (2,337.92 km) |
| Santander to Targovishte | 1,518.16 mi (2,443.24 km) |
| Santander to Teteven | 1,407.91 mi (2,265.81 km) |
| Santander to Troyan | 1,430.69 mi (2,302.48 km) |
| Santander to Tryavna | 1,469.78 mi (2,365.38 km) |
| Santander to Tutrakan | 1,510.08 mi (2,430.24 km) |
| Santander to Varna | 1,584.42 mi (2,549.87 km) |
