| Springboro to Smolyan | 5,276.87 mi (8,492.30 km) |
| Springboro to Sofia | 5,173.30 mi (8,325.62 km) |
| Springboro to Sopot | 5,230.15 mi (8,417.12 km) |
| Springboro to Sozopol | 5,352.47 mi (8,613.98 km) |
| Springboro to Sredets | 5,336.87 mi (8,588.86 km) |
| Springboro to Stamboliyski | 5,245.35 mi (8,441.57 km) |
| Springboro to Stara Zagora | 5,274.40 mi (8,488.32 km) |
| Springboro to Svilengrad | 5,326.16 mi (8,571.62 km) |
| Springboro to Svishtov | 5,208.82 mi (8,382.79 km) |
| Springboro to Targovishte | 5,271.86 mi (8,484.24 km) |
| Springboro to Teteven | 5,199.57 mi (8,367.90 km) |
| Springboro to Troyan | 5,218.27 mi (8,398.00 km) |
| Springboro to Tryavna | 5,248.79 mi (8,447.11 km) |
| Springboro to Tutrakan | 5,236.07 mi (8,426.65 km) |
| Springboro to Varna | 5,322.90 mi (8,566.38 km) |
