| Pen-y-Bont ar Ogwr to Smolyan | 1,495.65 mi (2,407.01 km) |
| Pen-y-Bont ar Ogwr to Sofia | 1,393.49 mi (2,242.60 km) |
| Pen-y-Bont ar Ogwr to Sopot | 1,454.59 mi (2,340.94 km) |
| Pen-y-Bont ar Ogwr to Sozopol | 1,587.64 mi (2,555.06 km) |
| Pen-y-Bont ar Ogwr to Sredets | 1,569.15 mi (2,525.30 km) |
| Pen-y-Bont ar Ogwr to Stamboliyski | 1,466.19 mi (2,359.61 km) |
| Pen-y-Bont ar Ogwr to Stara Zagora | 1,500.77 mi (2,415.26 km) |
| Pen-y-Bont ar Ogwr to Svilengrad | 1,550.42 mi (2,495.16 km) |
| Pen-y-Bont ar Ogwr to Svishtov | 1,442.91 mi (2,322.14 km) |
| Pen-y-Bont ar Ogwr to Targovishte | 1,508.70 mi (2,428.01 km) |
| Pen-y-Bont ar Ogwr to Teteven | 1,423.96 mi (2,291.64 km) |
| Pen-y-Bont ar Ogwr to Troyan | 1,444.08 mi (2,324.02 km) |
| Pen-y-Bont ar Ogwr to Tryavna | 1,477.57 mi (2,377.92 km) |
| Pen-y-Bont ar Ogwr to Tutrakan | 1,480.89 mi (2,383.26 km) |
| Pen-y-Bont ar Ogwr to Varna | 1,566.47 mi (2,520.99 km) |
