| Morriston to Smolyan | 1,513.54 mi (2,435.80 km) |
| Morriston to Sofia | 1,411.28 mi (2,271.24 km) |
| Morriston to Sopot | 1,472.20 mi (2,369.28 km) |
| Morriston to Sozopol | 1,604.90 mi (2,582.84 km) |
| Morriston to Sredets | 1,586.50 mi (2,553.22 km) |
| Morriston to Stamboliyski | 1,483.97 mi (2,388.21 km) |
| Morriston to Stara Zagora | 1,518.32 mi (2,443.50 km) |
| Morriston to Svilengrad | 1,568.06 mi (2,523.56 km) |
| Morriston to Svishtov | 1,460.15 mi (2,349.88 km) |
| Morriston to Targovishte | 1,525.87 mi (2,455.65 km) |
| Morriston to Teteven | 1,441.56 mi (2,319.97 km) |
| Morriston to Troyan | 1,461.63 mi (2,352.27 km) |
| Morriston to Tryavna | 1,495.01 mi (2,405.99 km) |
| Morriston to Tutrakan | 1,497.79 mi (2,410.46 km) |
| Morriston to Varna | 1,583.46 mi (2,548.33 km) |
