| Sioux City to Cascais | 4,358.36 mi (7,014.09 km) |
| Sioux City to Castelo Branco | 4,399.18 mi (7,079.79 km) |
| Sioux City to Castro Daire | 4,338.11 mi (6,981.52 km) |
| Sioux City to Celorico de Basto | 4,316.60 mi (6,946.90 km) |
| Sioux City to Chamusca | 4,374.34 mi (7,039.82 km) |
| Sioux City to Chaves | 4,325.56 mi (6,961.32 km) |
| Sioux City to Cinfaes | 4,321.75 mi (6,955.18 km) |
| Sioux City to Coimbra | 4,343.21 mi (6,989.72 km) |
| Sioux City to Condeixa-a-Nova | 4,343.77 mi (6,990.62 km) |
| Sioux City to Corroios | 4,373.52 mi (7,038.50 km) |
| Sioux City to Coruche | 4,387.80 mi (7,061.49 km) |
| Sioux City to Costa de Caparica | 4,368.58 mi (7,030.55 km) |
| Sioux City to Covilha | 4,380.88 mi (7,050.35 km) |
| Sioux City to Eiras | 4,342.23 mi (6,988.15 km) |
| Sioux City to Elvas | 4,452.09 mi (7,164.94 km) |
