| Duluth to Cortona | 4,684.65 mi (7,539.22 km) |
| Duluth to Cosenza | 5,035.66 mi (8,104.12 km) |
| Duluth to Cossato | 4,438.80 mi (7,143.56 km) |
| Duluth to Costa Volpino | 4,495.90 mi (7,235.45 km) |
| Duluth to Creazzo | 4,558.86 mi (7,336.78 km) |
| Duluth to Crema | 4,502.67 mi (7,246.35 km) |
| Duluth to Cremona | 4,526.12 mi (7,284.09 km) |
| Duluth to Crevalcore | 4,585.71 mi (7,379.99 km) |
| Duluth to Crispiano | 5,005.06 mi (8,054.87 km) |
| Duluth to Crosia | 5,040.85 mi (8,112.46 km) |
| Duluth to Crotone | 5,078.11 mi (8,172.43 km) |
| Duluth to Cuneo | 4,470.59 mi (7,194.72 km) |
| Duluth to Cuorgne | 4,428.14 mi (7,126.40 km) |
| Duluth to Cusano Milanino | 4,476.22 mi (7,203.78 km) |
| Duluth to Cutro | 5,075.83 mi (8,168.75 km) |
