| Llantrisant to Smolyan | 1,487.93 mi (2,394.59 km) |
| Llantrisant to Sofia | 1,385.70 mi (2,230.07 km) |
| Llantrisant to Sopot | 1,446.68 mi (2,328.20 km) |
| Llantrisant to Sozopol | 1,579.52 mi (2,542.00 km) |
| Llantrisant to Sredets | 1,561.08 mi (2,512.31 km) |
| Llantrisant to Stamboliyski | 1,458.39 mi (2,347.05 km) |
| Llantrisant to Stara Zagora | 1,492.82 mi (2,402.46 km) |
| Llantrisant to Svilengrad | 1,542.53 mi (2,482.46 km) |
| Llantrisant to Svishtov | 1,434.78 mi (2,309.06 km) |
| Llantrisant to Targovishte | 1,500.53 mi (2,414.87 km) |
| Llantrisant to Teteven | 1,416.04 mi (2,278.90 km) |
| Llantrisant to Troyan | 1,436.13 mi (2,311.23 km) |
| Llantrisant to Tryavna | 1,469.55 mi (2,365.02 km) |
| Llantrisant to Tutrakan | 1,472.60 mi (2,369.92 km) |
| Llantrisant to Varna | 1,558.22 mi (2,507.71 km) |
