| Donostia to Carson (California) | 5,764.09 mi (9,276.40 km) |
| Donostia to Carson City (Nevada) | 5,540.86 mi (8,917.15 km) |
| Donostia to Carteret (New Jersey) | 3,597.18 mi (5,789.10 km) |
| Donostia to Cartersville (Georgia) | 4,323.87 mi (6,958.59 km) |
| Donostia to Carthage (Missouri) | 4,629.72 mi (7,450.81 km) |
| Donostia to Cary (Illinois) | 4,163.75 mi (6,700.91 km) |
| Donostia to Cary (North Carolina) | 3,981.18 mi (6,407.09 km) |
| Donostia to Casa de Oro-Mount Helix (California) | 5,770.72 mi (9,287.08 km) |
| Donostia to Casa Grande (Arizona) | 5,558.19 mi (8,945.04 km) |
| Donostia to Casas Adobes (Arizona) | 5,555.79 mi (8,941.17 km) |
| Donostia to Cascades (Virginia) | 3,795.44 mi (6,108.17 km) |
| Donostia to Casper (Wyoming) | 4,868.65 mi (7,835.33 km) |
| Donostia to Casselberry (Florida) | 4,383.24 mi (7,054.15 km) |
| Donostia to Castaic (California) | 5,744.56 mi (9,244.98 km) |
| Donostia to Castle Pines (Colorado) | 4,967.53 mi (7,994.47 km) |
