| West Boldon to Smolyan | 1,500.89 mi (2,415.45 km) |
| West Boldon to Sofia | 1,396.62 mi (2,247.64 km) |
| West Boldon to Sopot | 1,449.74 mi (2,333.13 km) |
| West Boldon to Sozopol | 1,568.63 mi (2,524.47 km) |
| West Boldon to Sredets | 1,553.39 mi (2,499.94 km) |
| West Boldon to Stamboliyski | 1,467.44 mi (2,361.62 km) |
| West Boldon to Stara Zagora | 1,492.79 mi (2,402.41 km) |
| West Boldon to Svilengrad | 1,545.33 mi (2,486.96 km) |
| West Boldon to Svishtov | 1,425.32 mi (2,293.83 km) |
| West Boldon to Targovishte | 1,487.98 mi (2,394.67 km) |
| West Boldon to Teteven | 1,419.37 mi (2,284.26 km) |
| West Boldon to Troyan | 1,437.20 mi (2,312.95 km) |
| West Boldon to Tryavna | 1,466.39 mi (2,359.92 km) |
| West Boldon to Tutrakan | 1,452.30 mi (2,337.25 km) |
| West Boldon to Varna | 1,539.14 mi (2,477.00 km) |
