| Fort Madison to Smolyan | 5,490.78 mi (8,836.56 km) |
| Fort Madison to Sofia | 5,386.55 mi (8,668.81 km) |
| Fort Madison to Sopot | 5,439.52 mi (8,754.06 km) |
| Fort Madison to Sozopol | 5,554.02 mi (8,938.33 km) |
| Fort Madison to Sredets | 5,540.20 mi (8,916.09 km) |
| Fort Madison to Stamboliyski | 5,457.48 mi (8,782.97 km) |
| Fort Madison to Stara Zagora | 5,482.02 mi (8,822.46 km) |
| Fort Madison to Svilengrad | 5,534.88 mi (8,907.52 km) |
| Fort Madison to Svishtov | 5,412.40 mi (8,710.41 km) |
| Fort Madison to Targovishte | 5,473.34 mi (8,808.49 km) |
| Fort Madison to Teteven | 5,409.22 mi (8,705.30 km) |
| Fort Madison to Troyan | 5,426.76 mi (8,733.52 km) |
| Fort Madison to Tryavna | 5,455.05 mi (8,779.06 km) |
| Fort Madison to Tutrakan | 5,434.12 mi (8,745.37 km) |
| Fort Madison to Varna | 5,520.51 mi (8,884.41 km) |
