| Swansea to Smolyan | 5,544.86 mi (8,923.59 km) |
| Swansea to Sofia | 5,440.86 mi (8,756.21 km) |
| Swansea to Sopot | 5,495.69 mi (8,844.46 km) |
| Swansea to Sozopol | 5,613.89 mi (9,034.68 km) |
| Swansea to Sredets | 5,599.24 mi (9,011.11 km) |
| Swansea to Stamboliyski | 5,512.37 mi (8,871.31 km) |
| Swansea to Stara Zagora | 5,539.04 mi (8,914.22 km) |
| Swansea to Svilengrad | 5,591.43 mi (8,998.54 km) |
| Swansea to Svishtov | 5,471.21 mi (8,805.07 km) |
| Swansea to Targovishte | 5,533.17 mi (8,904.77 km) |
| Swansea to Teteven | 5,465.23 mi (8,795.44 km) |
| Swansea to Troyan | 5,483.33 mi (8,824.56 km) |
| Swansea to Tryavna | 5,512.67 mi (8,871.79 km) |
| Swansea to Tutrakan | 5,495.46 mi (8,844.09 km) |
| Swansea to Varna | 5,582.13 mi (8,983.57 km) |
