| Sioux Falls to Smolyan | 5,524.25 mi (8,890.42 km) |
| Sioux Falls to Sofia | 5,420.09 mi (8,722.79 km) |
| Sioux Falls to Sopot | 5,468.56 mi (8,800.79 km) |
| Sioux Falls to Sozopol | 5,574.01 mi (8,970.51 km) |
| Sioux Falls to Sredets | 5,562.16 mi (8,951.43 km) |
| Sioux Falls to Stamboliyski | 5,489.32 mi (8,834.20 km) |
| Sioux Falls to Stara Zagora | 5,508.91 mi (8,865.73 km) |
| Sioux Falls to Svilengrad | 5,562.53 mi (8,952.02 km) |
| Sioux Falls to Svishtov | 5,435.57 mi (8,747.70 km) |
| Sioux Falls to Targovishte | 5,493.87 mi (8,841.52 km) |
| Sioux Falls to Teteven | 5,438.79 mi (8,752.89 km) |
| Sioux Falls to Troyan | 5,454.97 mi (8,778.93 km) |
| Sioux Falls to Tryavna | 5,480.72 mi (8,820.37 km) |
| Sioux Falls to Tutrakan | 5,451.38 mi (8,773.14 km) |
| Sioux Falls to Varna | 5,536.68 mi (8,910.42 km) |
