| Sioux City to Sangeorgiu de Mures | 5,298.24 mi (8,526.70 km) |
| Sioux City to Sangeorz-Bai | 5,261.75 mi (8,467.97 km) |
| Sioux City to Sannicolau Mare | 5,201.00 mi (8,370.20 km) |
| Sioux City to Santana | 5,215.12 mi (8,392.93 km) |
| Sioux City to Satu Mare | 5,185.00 mi (8,344.46 km) |
| Sioux City to Scobinti | 5,328.66 mi (8,575.64 km) |
| Sioux City to Scornicesti | 5,405.03 mi (8,698.56 km) |
| Sioux City to Sebes | 5,301.11 mi (8,531.32 km) |
| Sioux City to Seini | 5,199.37 mi (8,367.58 km) |
| Sioux City to Sfantu-Gheorghe | 5,375.21 mi (8,650.56 km) |
| Sioux City to Sibiu | 5,328.16 mi (8,574.84 km) |
| Sioux City to Sighetu Marmatiei | 5,208.58 mi (8,382.41 km) |
| Sioux City to Sighisoara | 5,325.79 mi (8,571.03 km) |
| Sioux City to Simeria | 5,289.11 mi (8,511.99 km) |
| Sioux City to Sinaia | 5,395.21 mi (8,682.76 km) |
