| Llanelli to Smolyan | 1,523.13 mi (2,451.25 km) |
| Llanelli to Sofia | 1,420.90 mi (2,286.72 km) |
| Llanelli to Sopot | 1,481.85 mi (2,384.81 km) |
| Llanelli to Sozopol | 1,614.58 mi (2,598.42 km) |
| Llanelli to Sredets | 1,596.17 mi (2,568.79 km) |
| Llanelli to Stamboliyski | 1,493.59 mi (2,403.70 km) |
| Llanelli to Stara Zagora | 1,527.97 mi (2,459.03 km) |
| Llanelli to Svilengrad | 1,577.71 mi (2,539.07 km) |
| Llanelli to Svishtov | 1,469.83 mi (2,365.46 km) |
| Llanelli to Targovishte | 1,535.55 mi (2,471.24 km) |
| Llanelli to Teteven | 1,451.21 mi (2,335.50 km) |
| Llanelli to Troyan | 1,471.29 mi (2,367.81 km) |
| Llanelli to Tryavna | 1,504.68 mi (2,421.55 km) |
| Llanelli to Tutrakan | 1,507.49 mi (2,426.06 km) |
| Llanelli to Varna | 1,593.15 mi (2,563.92 km) |
