| Donostia to Cividale del Friuli | 779.45 mi (1,254.41 km) |
| Donostia to Civita Castellana | 731.92 mi (1,177.91 km) |
| Donostia to Civitanova Marche | 788.83 mi (1,269.50 km) |
| Donostia to Civitavecchia | 703.84 mi (1,132.73 km) |
| Donostia to Civitella in Val di Chiana | 687.21 mi (1,105.96 km) |
| Donostia to Clusone | 612.35 mi (985.48 km) |
| Donostia to Coccaglio | 609.28 mi (980.54 km) |
| Donostia to Codigoro | 706.57 mi (1,137.11 km) |
| Donostia to Codogno | 591.64 mi (952.16 km) |
| Donostia to Codroipo | 756.49 mi (1,217.45 km) |
| Donostia to Cogoleto | 534.17 mi (859.66 km) |
| Donostia to Colle di Val d'Elsa | 658.08 mi (1,059.08 km) |
| Donostia to Colle Salvetti | 624.77 mi (1,005.47 km) |
| Donostia to Collecchio | 613.24 mi (986.91 km) |
| Donostia to Colleferro | 770.38 mi (1,239.80 km) |
