| Donostia to Cloverly (Maryland) | 3,775.42 mi (6,075.95 km) |
| Donostia to Clovis (California) | 5,660.29 mi (9,109.36 km) |
| Donostia to Clovis (New Mexico) | 5,130.73 mi (8,257.10 km) |
| Donostia to Clute (Texas) | 5,033.09 mi (8,099.98 km) |
| Donostia to Coachella (California) | 5,691.19 mi (9,159.08 km) |
| Donostia to Coalinga (California) | 5,719.46 mi (9,204.59 km) |
| Donostia to Coamo (Puerto Rico) | 4,091.00 mi (6,583.83 km) |
| Donostia to Coatesville (Pennsylvania) | 3,690.65 mi (5,939.52 km) |
| Donostia to Cockeysville (Maryland) | 3,745.29 mi (6,027.47 km) |
| Donostia to Cocoa (Florida) | 4,367.99 mi (7,029.60 km) |
| Donostia to Cocoa Beach (Florida) | 4,363.23 mi (7,021.93 km) |
| Donostia to Coconut Creek (Florida) | 4,427.48 mi (7,125.34 km) |
| Donostia to Coeur d'Alene (Idaho) | 5,003.88 mi (8,052.97 km) |
| Donostia to Cohoes (New York) | 3,503.18 mi (5,637.83 km) |
| Donostia to Cold Springs (Nevada) | 5,520.52 mi (8,884.43 km) |
