| Irondale to Smolyan | 5,663.64 mi (9,114.75 km) |
| Irondale to Sofia | 5,560.86 mi (8,949.34 km) |
| Irondale to Sopot | 5,619.94 mi (9,044.41 km) |
| Irondale to Sozopol | 5,746.51 mi (9,248.11 km) |
| Irondale to Sredets | 5,729.91 mi (9,221.40 km) |
| Irondale to Stamboliyski | 5,633.36 mi (9,066.01 km) |
| Irondale to Stara Zagora | 5,665.09 mi (9,117.08 km) |
| Irondale to Svilengrad | 5,716.01 mi (9,199.03 km) |
| Irondale to Svishtov | 5,602.14 mi (9,015.77 km) |
| Irondale to Targovishte | 5,666.19 mi (9,118.85 km) |
| Irondale to Teteven | 5,589.28 mi (8,995.08 km) |
| Irondale to Troyan | 5,608.63 mi (9,026.21 km) |
| Irondale to Tryavna | 5,640.38 mi (9,077.32 km) |
| Irondale to Tutrakan | 5,632.46 mi (9,064.58 km) |
| Irondale to Varna | 5,719.26 mi (9,204.26 km) |
