| Boiling Springs to Smolyan | 5,399.58 mi (8,689.78 km) |
| Boiling Springs to Sofia | 5,297.35 mi (8,525.27 km) |
| Boiling Springs to Sopot | 5,357.62 mi (8,622.26 km) |
| Boiling Springs to Sozopol | 5,486.63 mi (8,829.89 km) |
| Boiling Springs to Sredets | 5,469.43 mi (8,802.20 km) |
| Boiling Springs to Stamboliyski | 5,370.01 mi (8,642.20 km) |
| Boiling Springs to Stara Zagora | 5,403.26 mi (8,695.71 km) |
| Boiling Springs to Svilengrad | 5,453.62 mi (8,776.75 km) |
| Boiling Springs to Svishtov | 5,341.99 mi (8,597.11 km) |
| Boiling Springs to Targovishte | 5,406.61 mi (8,701.10 km) |
| Boiling Springs to Teteven | 5,326.96 mi (8,572.92 km) |
| Boiling Springs to Troyan | 5,346.67 mi (8,604.63 km) |
| Boiling Springs to Tryavna | 5,379.12 mi (8,656.86 km) |
| Boiling Springs to Tutrakan | 5,374.28 mi (8,649.08 km) |
| Boiling Springs to Varna | 5,460.95 mi (8,788.55 km) |
