| Risca to Smolyan | 1,477.56 mi (2,377.91 km) |
| Risca to Sofia | 1,375.22 mi (2,213.20 km) |
| Risca to Sopot | 1,435.98 mi (2,310.99 km) |
| Risca to Sozopol | 1,568.48 mi (2,524.22 km) |
| Risca to Sredets | 1,550.12 mi (2,494.67 km) |
| Risca to Stamboliyski | 1,447.88 mi (2,330.14 km) |
| Risca to Stara Zagora | 1,482.05 mi (2,385.13 km) |
| Risca to Svilengrad | 1,531.87 mi (2,465.30 km) |
| Risca to Svishtov | 1,423.72 mi (2,291.25 km) |
| Risca to Targovishte | 1,489.41 mi (2,396.98 km) |
| Risca to Teteven | 1,405.34 mi (2,261.68 km) |
| Risca to Troyan | 1,425.37 mi (2,293.91 km) |
| Risca to Tryavna | 1,458.68 mi (2,347.52 km) |
| Risca to Tutrakan | 1,461.26 mi (2,351.67 km) |
| Risca to Varna | 1,546.94 mi (2,489.56 km) |
