| Sonseca to Smolyan | 1,500.77 mi (2,415.25 km) |
| Sonseca to Sofia | 1,426.92 mi (2,296.40 km) |
| Sonseca to Sopot | 1,499.12 mi (2,412.59 km) |
| Sonseca to Sozopol | 1,649.95 mi (2,655.34 km) |
| Sonseca to Sredets | 1,624.84 mi (2,614.92 km) |
| Sonseca to Stamboliyski | 1,489.65 mi (2,397.36 km) |
| Sonseca to Stara Zagora | 1,545.54 mi (2,487.30 km) |
| Sonseca to Svilengrad | 1,576.86 mi (2,537.71 km) |
| Sonseca to Svishtov | 1,528.27 mi (2,459.52 km) |
| Sonseca to Targovishte | 1,590.50 mi (2,559.66 km) |
| Sonseca to Teteven | 1,474.15 mi (2,372.41 km) |
| Sonseca to Troyan | 1,496.96 mi (2,409.13 km) |
| Sonseca to Tryavna | 1,536.64 mi (2,472.99 km) |
| Sonseca to Tutrakan | 1,591.48 mi (2,561.24 km) |
| Sonseca to Varna | 1,657.66 mi (2,667.74 km) |
