| Sioux City to Sesena | 4,551.76 mi (7,325.35 km) |
| Sioux City to Sestao | 4,451.24 mi (7,163.57 km) |
| Sioux City to Sevilla | 4,568.95 mi (7,353.02 km) |
| Sioux City to Sevilla La Nueva | 4,527.74 mi (7,286.70 km) |
| Sioux City to Silla | 4,722.05 mi (7,599.41 km) |
| Sioux City to Silleda | 4,256.48 mi (6,850.14 km) |
| Sioux City to Sitges | 4,734.01 mi (7,618.65 km) |
| Sioux City to Socuellamos | 4,623.70 mi (7,441.12 km) |
| Sioux City to Soller | 4,834.18 mi (7,779.87 km) |
| Sioux City to Solsona | 4,689.91 mi (7,547.68 km) |
| Sioux City to Son Servera | 4,867.70 mi (7,833.81 km) |
| Sioux City to Sonseca | 4,557.46 mi (7,334.52 km) |
| Sioux City to Sopelana | 4,449.50 mi (7,160.78 km) |
| Sioux City to Soria | 4,535.82 mi (7,299.69 km) |
| Sioux City to Suances | 4,403.43 mi (7,086.63 km) |
