| Sligo to Smolyan | 1,745.48 mi (2,809.08 km) |
| Sligo to Sofia | 1,641.93 mi (2,642.43 km) |
| Sligo to Sopot | 1,699.44 mi (2,734.99 km) |
| Sligo to Sozopol | 1,825.65 mi (2,938.10 km) |
| Sligo to Sredets | 1,808.84 mi (2,911.04 km) |
| Sligo to Stamboliyski | 1,714.04 mi (2,758.49 km) |
| Sligo to Stara Zagora | 1,744.24 mi (2,807.08 km) |
| Sligo to Svilengrad | 1,795.51 mi (2,889.60 km) |
| Sligo to Svishtov | 1,681.15 mi (2,705.55 km) |
| Sligo to Targovishte | 1,745.50 mi (2,809.11 km) |
| Sligo to Teteven | 1,668.81 mi (2,685.69 km) |
| Sligo to Troyan | 1,687.88 mi (2,716.37 km) |
| Sligo to Tryavna | 1,719.31 mi (2,766.97 km) |
| Sligo to Tutrakan | 1,713.18 mi (2,757.10 km) |
| Sligo to Varna | 1,799.79 mi (2,896.48 km) |
