| Blackburn to Smolyan | 1,503.99 mi (2,420.43 km) |
| Blackburn to Sofia | 1,400.10 mi (2,253.24 km) |
| Blackburn to Sopot | 1,456.35 mi (2,343.76 km) |
| Blackburn to Sozopol | 1,580.82 mi (2,544.09 km) |
| Blackburn to Sredets | 1,564.34 mi (2,517.57 km) |
| Blackburn to Stamboliyski | 1,471.88 mi (2,368.76 km) |
| Blackburn to Stara Zagora | 1,500.70 mi (2,415.14 km) |
| Blackburn to Svilengrad | 1,552.35 mi (2,498.27 km) |
| Blackburn to Svishtov | 1,436.50 mi (2,311.82 km) |
| Blackburn to Targovishte | 1,500.53 mi (2,414.87 km) |
| Blackburn to Teteven | 1,425.76 mi (2,294.55 km) |
| Blackburn to Troyan | 1,444.50 mi (2,324.70 km) |
| Blackburn to Tryavna | 1,475.37 mi (2,374.38 km) |
| Blackburn to Tutrakan | 1,467.60 mi (2,361.88 km) |
| Blackburn to Varna | 1,554.28 mi (2,501.37 km) |
