| West Springfield to Smolyan | 5,032.24 mi (8,098.61 km) |
| West Springfield to Sofia | 4,929.92 mi (7,933.94 km) |
| West Springfield to Sopot | 4,990.03 mi (8,030.67 km) |
| West Springfield to Sozopol | 5,118.84 mi (8,237.98 km) |
| West Springfield to Sredets | 5,101.67 mi (8,210.35 km) |
| West Springfield to Stamboliyski | 5,002.56 mi (8,050.84 km) |
| West Springfield to Stara Zagora | 5,035.61 mi (8,104.04 km) |
| West Springfield to Svilengrad | 5,086.04 mi (8,185.19 km) |
| West Springfield to Svishtov | 4,974.21 mi (8,005.22 km) |
| West Springfield to Targovishte | 5,038.80 mi (8,109.17 km) |
| West Springfield to Teteven | 4,959.37 mi (7,981.33 km) |
| West Springfield to Troyan | 4,979.03 mi (8,012.97 km) |
| West Springfield to Tryavna | 5,011.42 mi (8,065.10 km) |
| West Springfield to Tutrakan | 5,006.45 mi (8,057.09 km) |
| West Springfield to Varna | 5,093.11 mi (8,196.57 km) |
