| Duluth to Cascais | 4,038.21 mi (6,498.88 km) |
| Duluth to Castelo Branco | 4,073.25 mi (6,555.27 km) |
| Duluth to Castro Daire | 4,010.06 mi (6,453.56 km) |
| Duluth to Celorico de Basto | 3,987.43 mi (6,417.15 km) |
| Duluth to Chamusca | 4,051.04 mi (6,519.52 km) |
| Duluth to Chaves | 3,994.83 mi (6,429.06 km) |
| Duluth to Cinfaes | 3,993.45 mi (6,426.84 km) |
| Duluth to Coimbra | 4,017.59 mi (6,465.68 km) |
| Duluth to Condeixa-a-Nova | 4,018.49 mi (6,467.14 km) |
| Duluth to Corroios | 4,053.20 mi (6,523.00 km) |
| Duluth to Coruche | 4,065.61 mi (6,542.97 km) |
| Duluth to Costa de Caparica | 4,048.31 mi (6,515.13 km) |
| Duluth to Covilha | 4,053.79 mi (6,523.94 km) |
| Duluth to Eiras | 4,016.52 mi (6,463.97 km) |
| Duluth to Elvas | 4,128.08 mi (6,643.51 km) |
