| Watford to Cernavoda | 1,397.37 mi (2,248.85 km) |
| Watford to Chitila | 1,304.86 mi (2,099.98 km) |
| Watford to Cisnadie | 1,185.75 mi (1,908.28 km) |
| Watford to Cluj-Napoca | 1,127.89 mi (1,815.16 km) |
| Watford to Codlea | 1,240.89 mi (1,997.02 km) |
| Watford to Comanesti | 1,260.19 mi (2,028.08 km) |
| Watford to Comarnic | 1,264.05 mi (2,034.29 km) |
| Watford to Constanta | 1,428.87 mi (2,299.54 km) |
| Watford to Corabia | 1,270.82 mi (2,045.19 km) |
| Watford to Costesti | 1,252.85 mi (2,016.27 km) |
| Watford to Covasna | 1,267.31 mi (2,039.54 km) |
| Watford to Craiova | 1,221.03 mi (1,965.05 km) |
| Watford to Cristuru Secuiesc | 1,204.29 mi (1,938.12 km) |
| Watford to Cugir | 1,148.21 mi (1,847.86 km) |
| Watford to Cumpana | 1,427.55 mi (2,297.41 km) |
