| Donostia to Cortona | 701.59 mi (1,129.09 km) |
| Donostia to Cosenza | 983.76 mi (1,583.20 km) |
| Donostia to Cossato | 523.62 mi (842.68 km) |
| Donostia to Costa Volpino | 618.59 mi (995.53 km) |
| Donostia to Creazzo | 680.80 mi (1,095.65 km) |
| Donostia to Crema | 592.83 mi (954.06 km) |
| Donostia to Cremona | 607.23 mi (977.25 km) |
| Donostia to Crevalcore | 658.73 mi (1,060.13 km) |
| Donostia to Crispiano | 1,002.53 mi (1,613.41 km) |
| Donostia to Crosia | 1,002.58 mi (1,613.50 km) |
| Donostia to Crotone | 1,032.37 mi (1,661.44 km) |
| Donostia to Cuneo | 480.20 mi (772.81 km) |
| Donostia to Cuorgne | 496.41 mi (798.90 km) |
| Donostia to Cusano Milanino | 571.35 mi (919.51 km) |
| Donostia to Cutro | 1,027.08 mi (1,652.92 km) |
