| Somerset to Smolyan | 4,844.27 mi (7,796.10 km) |
| Somerset to Sofia | 4,741.95 mi (7,631.43 km) |
| Somerset to Sopot | 4,802.07 mi (7,728.18 km) |
| Somerset to Sozopol | 4,930.96 mi (7,935.61 km) |
| Somerset to Sredets | 4,913.76 mi (7,907.94 km) |
| Somerset to Stamboliyski | 4,814.58 mi (7,748.33 km) |
| Somerset to Stara Zagora | 4,847.66 mi (7,801.55 km) |
| Somerset to Svilengrad | 4,898.07 mi (7,882.69 km) |
| Somerset to Svishtov | 4,786.32 mi (7,702.83 km) |
| Somerset to Targovishte | 4,850.94 mi (7,806.83 km) |
| Somerset to Teteven | 4,771.40 mi (7,678.83 km) |
| Somerset to Troyan | 4,791.07 mi (7,710.49 km) |
| Somerset to Tryavna | 4,823.48 mi (7,762.64 km) |
| Somerset to Tutrakan | 4,818.67 mi (7,754.89 km) |
| Somerset to Varna | 4,905.32 mi (7,894.35 km) |
