| Duluth to Carmona | 4,252.74 mi (6,844.12 km) |
| Duluth to Cartagena | 4,442.79 mi (7,149.98 km) |
| Duluth to Cartama | 4,328.55 mi (6,966.13 km) |
| Duluth to Cartaya | 4,195.73 mi (6,752.37 km) |
| Duluth to Caspe | 4,320.05 mi (6,952.45 km) |
| Duluth to Cassa de la Selva | 4,406.07 mi (7,090.88 km) |
| Duluth to Castalla | 4,411.02 mi (7,098.84 km) |
| Duluth to Castellbisbal | 4,389.47 mi (7,064.17 km) |
| Duluth to Castelldefels | 4,398.04 mi (7,077.96 km) |
| Duluth to Castello de Ampurias | 4,397.35 mi (7,076.85 km) |
| Duluth to Castellon de la Plana | 4,375.31 mi (7,041.38 km) |
| Duluth to Castilleja de la Cuesta | 4,238.57 mi (6,821.31 km) |
| Duluth to Catarroja | 4,386.00 mi (7,058.59 km) |
| Duluth to Catral | 4,425.04 mi (7,121.41 km) |
| Duluth to Caudete | 4,393.14 mi (7,070.07 km) |
