| Blackrock to Smolyan | 1,636.14 mi (2,633.11 km) |
| Blackrock to Sofia | 1,532.90 mi (2,466.97 km) |
| Blackrock to Sopot | 1,591.49 mi (2,561.25 km) |
| Blackrock to Sozopol | 1,719.82 mi (2,767.79 km) |
| Blackrock to Sredets | 1,702.49 mi (2,739.89 km) |
| Blackrock to Stamboliyski | 1,605.24 mi (2,583.38 km) |
| Blackrock to Stara Zagora | 1,636.72 mi (2,634.05 km) |
| Blackrock to Svilengrad | 1,687.56 mi (2,715.86 km) |
| Blackrock to Svishtov | 1,575.12 mi (2,534.91 km) |
| Blackrock to Targovishte | 1,639.96 mi (2,639.27 km) |
| Blackrock to Teteven | 1,560.83 mi (2,511.91 km) |
| Blackrock to Troyan | 1,580.22 mi (2,543.11 km) |
| Blackrock to Tryavna | 1,612.28 mi (2,594.71 km) |
| Blackrock to Tutrakan | 1,608.99 mi (2,589.41 km) |
| Blackrock to Varna | 1,695.37 mi (2,728.43 km) |
