| Sioux City to Sierpc | 4,831.40 mi (7,775.39 km) |
| Sioux City to Skarzysko-Kamienna | 4,955.95 mi (7,975.83 km) |
| Sioux City to Skawina | 4,979.49 mi (8,013.72 km) |
| Sioux City to Skierniewice | 4,890.80 mi (7,870.99 km) |
| Sioux City to Skoczow | 4,956.01 mi (7,975.92 km) |
| Sioux City to Skwierzyna | 4,719.31 mi (7,594.99 km) |
| Sioux City to Slawno | 4,672.44 mi (7,519.56 km) |
| Sioux City to Slubice | 4,701.90 mi (7,566.97 km) |
| Sioux City to Slupca | 4,805.98 mi (7,734.48 km) |
| Sioux City to Slupsk | 4,677.81 mi (7,528.21 km) |
| Sioux City to Sochaczew | 4,880.10 mi (7,853.75 km) |
| Sioux City to Sokolka | 4,915.29 mi (7,910.40 km) |
| Sioux City to Sokolow Podlaski | 4,930.61 mi (7,935.06 km) |
| Sioux City to Solec Kujawski | 4,779.28 mi (7,691.51 km) |
| Sioux City to Sopot | 4,723.35 mi (7,601.49 km) |
