| Sioux City to Montalegre | 4,308.68 mi (6,934.15 km) |
| Sioux City to Montemor-o-Novo | 4,413.61 mi (7,103.01 km) |
| Sioux City to Montemor-o-Velho | 4,333.81 mi (6,974.60 km) |
| Sioux City to Montijo | 4,381.99 mi (7,052.13 km) |
| Sioux City to Mortagua | 4,343.15 mi (6,989.62 km) |
| Sioux City to Moura | 4,468.10 mi (7,190.72 km) |
| Sioux City to Murtosa | 4,314.16 mi (6,942.97 km) |
| Sioux City to Nazare | 4,338.90 mi (6,982.78 km) |
| Sioux City to Nelas | 4,356.58 mi (7,011.24 km) |
| Sioux City to Obidos | 4,344.25 mi (6,991.40 km) |
| Sioux City to Odemira | 4,437.29 mi (7,141.13 km) |
| Sioux City to Odivelas | 4,365.38 mi (7,025.39 km) |
| Sioux City to Oeiras | 4,363.46 mi (7,022.31 km) |
| Sioux City to Olhao | 4,495.08 mi (7,234.14 km) |
| Sioux City to Oliveira de Azemeis | 4,316.94 mi (6,947.44 km) |
