| Solothurn to Carmona | 949.34 mi (1,527.81 km) |
| Solothurn to Cartagena | 792.77 mi (1,275.85 km) |
| Solothurn to Cartama | 955.49 mi (1,537.72 km) |
| Solothurn to Cartaya | 1,014.24 mi (1,632.26 km) |
| Solothurn to Caspe | 557.38 mi (897.02 km) |
| Solothurn to Cassa de la Selva | 433.53 mi (697.70 km) |
| Solothurn to Castalla | 725.12 mi (1,166.97 km) |
| Solothurn to Castellbisbal | 481.92 mi (775.57 km) |
| Solothurn to Castelldefels | 493.55 mi (794.30 km) |
| Solothurn to Castello de Ampurias | 406.36 mi (653.98 km) |
| Solothurn to Castellon de la Plana | 626.35 mi (1,008.01 km) |
| Solothurn to Castilleja de la Cuesta | 968.67 mi (1,558.92 km) |
| Solothurn to Catarroja | 670.61 mi (1,079.24 km) |
| Solothurn to Catral | 754.64 mi (1,214.48 km) |
| Solothurn to Caudete | 728.13 mi (1,171.82 km) |
