| Penarth to Smolyan | 1,477.28 mi (2,377.45 km) |
| Penarth to Sofia | 1,375.12 mi (2,213.05 km) |
| Penarth to Sopot | 1,436.25 mi (2,311.42 km) |
| Penarth to Sozopol | 1,569.37 mi (2,525.65 km) |
| Penarth to Sredets | 1,550.85 mi (2,495.86 km) |
| Penarth to Stamboliyski | 1,447.83 mi (2,330.05 km) |
| Penarth to Stara Zagora | 1,482.44 mi (2,385.76 km) |
| Penarth to Svilengrad | 1,532.07 mi (2,465.63 km) |
| Penarth to Svishtov | 1,424.64 mi (2,292.74 km) |
| Penarth to Targovishte | 1,490.44 mi (2,398.64 km) |
| Penarth to Teteven | 1,405.61 mi (2,262.12 km) |
| Penarth to Troyan | 1,425.75 mi (2,294.52 km) |
| Penarth to Tryavna | 1,459.25 mi (2,348.44 km) |
| Penarth to Tutrakan | 1,462.71 mi (2,354.01 km) |
| Penarth to Varna | 1,548.27 mi (2,491.70 km) |
