| Solothurn to Cocentaina | 709.85 mi (1,142.39 km) |
| Solothurn to Coin | 961.93 mi (1,548.08 km) |
| Solothurn to Colindres | 594.61 mi (956.94 km) |
| Solothurn to Collado-Villalba | 731.36 mi (1,177.01 km) |
| Solothurn to Colmenar Viejo | 720.79 mi (1,160.00 km) |
| Solothurn to Colmenarejo | 735.07 mi (1,182.98 km) |
| Solothurn to Conil de la Frontera | 1,029.11 mi (1,656.20 km) |
| Solothurn to Consuegra | 773.45 mi (1,244.75 km) |
| Solothurn to Corbera de Llobregat | 486.82 mi (783.46 km) |
| Solothurn to Cordoba | 897.09 mi (1,443.73 km) |
| Solothurn to Coria del Rio | 973.88 mi (1,567.30 km) |
| Solothurn to Crevillente | 749.50 mi (1,206.20 km) |
| Solothurn to Cuarte de Huerva | 569.92 mi (917.19 km) |
| Solothurn to Cubellas | 506.08 mi (814.46 km) |
| Solothurn to Cuellar | 709.10 mi (1,141.19 km) |
