| Knowsley to Smolyan | 1,510.15 mi (2,430.34 km) |
| Knowsley to Sofia | 1,406.43 mi (2,263.43 km) |
| Knowsley to Sopot | 1,463.47 mi (2,355.23 km) |
| Knowsley to Sozopol | 1,589.33 mi (2,557.78 km) |
| Knowsley to Sredets | 1,572.54 mi (2,530.76 km) |
| Knowsley to Stamboliyski | 1,478.42 mi (2,379.28 km) |
| Knowsley to Stara Zagora | 1,508.13 mi (2,427.11 km) |
| Knowsley to Svilengrad | 1,559.53 mi (2,509.82 km) |
| Knowsley to Svishtov | 1,444.83 mi (2,325.24 km) |
| Knowsley to Targovishte | 1,509.18 mi (2,428.79 km) |
| Knowsley to Teteven | 1,432.85 mi (2,305.96 km) |
| Knowsley to Troyan | 1,451.82 mi (2,336.47 km) |
| Knowsley to Tryavna | 1,483.11 mi (2,386.83 km) |
| Knowsley to Tutrakan | 1,476.99 mi (2,376.99 km) |
| Knowsley to Varna | 1,563.57 mi (2,516.32 km) |
