| Donostia to Cernavoda | 1,489.29 mi (2,396.79 km) |
| Donostia to Chitila | 1,387.38 mi (2,232.77 km) |
| Donostia to Cisnadie | 1,292.10 mi (2,079.44 km) |
| Donostia to Cluj-Napoca | 1,264.62 mi (2,035.22 km) |
| Donostia to Codlea | 1,354.49 mi (2,179.84 km) |
| Donostia to Comanesti | 1,400.73 mi (2,254.25 km) |
| Donostia to Comarnic | 1,365.67 mi (2,197.83 km) |
| Donostia to Constanta | 1,520.36 mi (2,446.79 km) |
| Donostia to Corabia | 1,320.97 mi (2,125.90 km) |
| Donostia to Costesti | 1,332.29 mi (2,144.12 km) |
| Donostia to Covasna | 1,389.63 mi (2,236.40 km) |
| Donostia to Craiova | 1,282.47 mi (2,063.93 km) |
| Donostia to Cristuru Secuiesc | 1,333.49 mi (2,146.05 km) |
| Donostia to Cugir | 1,253.93 mi (2,018.01 km) |
| Donostia to Cumpana | 1,517.12 mi (2,441.57 km) |
