| Syston to Smolyan | 1,422.61 mi (2,289.48 km) |
| Syston to Sofia | 1,319.08 mi (2,122.85 km) |
| Syston to Sopot | 1,376.85 mi (2,215.82 km) |
| Syston to Sozopol | 1,504.22 mi (2,420.80 km) |
| Syston to Sredets | 1,487.05 mi (2,393.18 km) |
| Syston to Stamboliyski | 1,391.23 mi (2,238.96 km) |
| Syston to Stara Zagora | 1,421.82 mi (2,288.20 km) |
| Syston to Svilengrad | 1,472.92 mi (2,370.44 km) |
| Syston to Svishtov | 1,359.56 mi (2,188.01 km) |
| Syston to Targovishte | 1,424.27 mi (2,292.14 km) |
| Syston to Teteven | 1,346.21 mi (2,166.51 km) |
| Syston to Troyan | 1,365.39 mi (2,197.39 km) |
| Syston to Tryavna | 1,397.13 mi (2,248.46 km) |
| Syston to Tutrakan | 1,393.07 mi (2,241.93 km) |
| Syston to Varna | 1,479.47 mi (2,380.98 km) |
