| Onex to Cernavoda | 1,070.83 mi (1,723.34 km) |
| Onex to Chitila | 969.80 mi (1,560.75 km) |
| Onex to Cisnadie | 865.92 mi (1,393.57 km) |
| Onex to Cluj-Napoca | 831.16 mi (1,337.62 km) |
| Onex to Codlea | 927.75 mi (1,493.06 km) |
| Onex to Comanesti | 968.76 mi (1,559.07 km) |
| Onex to Comarnic | 942.21 mi (1,516.34 km) |
| Onex to Constanta | 1,102.56 mi (1,774.39 km) |
| Onex to Corabia | 912.57 mi (1,468.63 km) |
| Onex to Costesti | 914.48 mi (1,471.71 km) |
| Onex to Covasna | 961.44 mi (1,547.29 km) |
| Onex to Craiova | 869.22 mi (1,398.88 km) |
| Onex to Cristuru Secuiesc | 902.79 mi (1,452.90 km) |
| Onex to Cugir | 827.09 mi (1,331.07 km) |
| Onex to Cumpana | 1,099.83 mi (1,770.00 km) |
