| Siechnice to Smolyan | 745.00 mi (1,198.96 km) |
| Siechnice to Sofia | 645.16 mi (1,038.29 km) |
| Siechnice to Sopot | 680.87 mi (1,095.75 km) |
| Siechnice to Sozopol | 775.78 mi (1,248.49 km) |
| Siechnice to Sredets | 764.69 mi (1,230.65 km) |
| Siechnice to Stamboliyski | 707.18 mi (1,138.10 km) |
| Siechnice to Stara Zagora | 716.79 mi (1,153.56 km) |
| Siechnice to Svilengrad | 770.79 mi (1,240.46 km) |
| Siechnice to Svishtov | 639.65 mi (1,029.41 km) |
| Siechnice to Targovishte | 695.91 mi (1,119.95 km) |
| Siechnice to Teteven | 652.94 mi (1,050.80 km) |
| Siechnice to Troyan | 665.99 mi (1,071.81 km) |
| Siechnice to Tryavna | 687.26 mi (1,106.03 km) |
| Siechnice to Tutrakan | 653.09 mi (1,051.05 km) |
| Siechnice to Varna | 738.79 mi (1,188.96 km) |
