| Slough to Smolyan | 1,373.41 mi (2,210.29 km) |
| Slough to Sofia | 1,270.69 mi (2,044.97 km) |
| Slough to Sopot | 1,330.72 mi (2,141.59 km) |
| Slough to Sozopol | 1,462.17 mi (2,353.13 km) |
| Slough to Sredets | 1,444.03 mi (2,323.94 km) |
| Slough to Stamboliyski | 1,343.25 mi (2,161.76 km) |
| Slough to Stara Zagora | 1,376.55 mi (2,215.34 km) |
| Slough to Svilengrad | 1,426.69 mi (2,296.04 km) |
| Slough to Svishtov | 1,317.38 mi (2,120.12 km) |
| Slough to Targovishte | 1,382.91 mi (2,225.59 km) |
| Slough to Teteven | 1,300.06 mi (2,092.25 km) |
| Slough to Troyan | 1,319.90 mi (2,124.18 km) |
| Slough to Tryavna | 1,352.88 mi (2,177.25 km) |
| Slough to Tutrakan | 1,354.27 mi (2,179.49 km) |
| Slough to Varna | 1,440.08 mi (2,317.59 km) |
