| SeaTac to Cocentaina | 5,491.42 mi (8,837.58 km) |
| SeaTac to Coin | 5,465.73 mi (8,796.25 km) |
| SeaTac to Colindres | 5,140.32 mi (8,272.54 km) |
| SeaTac to Collado-Villalba | 5,273.39 mi (8,486.70 km) |
| SeaTac to Colmenar Viejo | 5,279.77 mi (8,496.97 km) |
| SeaTac to Colmenarejo | 5,277.07 mi (8,492.62 km) |
| SeaTac to Conil de la Frontera | 5,442.00 mi (8,758.05 km) |
| SeaTac to Consuegra | 5,350.47 mi (8,610.76 km) |
| SeaTac to Corbera de Llobregat | 5,413.16 mi (8,711.64 km) |
| SeaTac to Cordoba | 5,398.18 mi (8,687.53 km) |
| SeaTac to Coria del Rio | 5,388.00 mi (8,671.14 km) |
| SeaTac to Crevillente | 5,507.58 mi (8,863.59 km) |
| SeaTac to Cuarte de Huerva | 5,318.06 mi (8,558.59 km) |
| SeaTac to Cubellas | 5,417.24 mi (8,718.21 km) |
| SeaTac to Cuellar | 5,221.77 mi (8,403.63 km) |
