| Duluth to Cadiz | 4,264.84 mi (6,863.59 km) |
| Duluth to Calafell | 4,385.44 mi (7,057.69 km) |
| Duluth to Calahorra | 4,196.23 mi (6,753.18 km) |
| Duluth to Calasparra | 4,384.76 mi (7,056.58 km) |
| Duluth to Calatayud | 4,250.56 mi (6,840.62 km) |
| Duluth to Caldas de Montbuy | 4,389.81 mi (7,064.71 km) |
| Duluth to Caldas de Reyes | 3,911.50 mi (6,294.96 km) |
| Duluth to Calella | 4,410.06 mi (7,097.30 km) |
| Duluth to Callosa de Segura | 4,423.60 mi (7,119.10 km) |
| Duluth to Calpe | 4,438.24 mi (7,142.65 km) |
| Duluth to Calvia | 4,496.45 mi (7,236.33 km) |
| Duluth to Camas | 4,238.47 mi (6,821.16 km) |
| Duluth to Cambados | 3,908.91 mi (6,290.79 km) |
| Duluth to Cambre | 3,896.95 mi (6,271.54 km) |
| Duluth to Cambrils | 4,370.97 mi (7,034.40 km) |
