| Knowle to Smolyan | 1,440.20 mi (2,317.79 km) |
| Knowle to Sofia | 1,336.98 mi (2,151.66 km) |
| Knowle to Sopot | 1,395.69 mi (2,246.15 km) |
| Knowle to Sozopol | 1,524.69 mi (2,453.75 km) |
| Knowle to Sredets | 1,507.15 mi (2,425.52 km) |
| Knowle to Stamboliyski | 1,409.32 mi (2,268.09 km) |
| Knowle to Stara Zagora | 1,441.02 mi (2,319.10 km) |
| Knowle to Svilengrad | 1,491.76 mi (2,400.75 km) |
| Knowle to Svishtov | 1,379.93 mi (2,220.79 km) |
| Knowle to Targovishte | 1,444.97 mi (2,325.46 km) |
| Knowle to Teteven | 1,365.03 mi (2,196.81 km) |
| Knowle to Troyan | 1,384.49 mi (2,228.12 km) |
| Knowle to Tryavna | 1,416.72 mi (2,279.99 km) |
| Knowle to Tutrakan | 1,414.69 mi (2,276.72 km) |
| Knowle to Varna | 1,500.91 mi (2,415.48 km) |
