| Watford to Caltagirone | 1,233.07 mi (1,984.43 km) |
| Watford to Caltanissetta | 1,205.31 mi (1,939.77 km) |
| Watford to Calvisano | 655.81 mi (1,055.43 km) |
| Watford to Calvizzano | 1,014.62 mi (1,632.87 km) |
| Watford to Camaiore | 727.31 mi (1,170.50 km) |
| Watford to Cameri | 592.32 mi (953.24 km) |
| Watford to Camisano Vicentino | 695.90 mi (1,119.94 km) |
| Watford to Campagna | 1,057.08 mi (1,701.20 km) |
| Watford to Campagnano di Roma | 890.13 mi (1,432.53 km) |
| Watford to Campi Bisenzio | 760.07 mi (1,223.22 km) |
| Watford to Campi Salentina | 1,170.82 mi (1,884.26 km) |
| Watford to Campiglia Marittima | 784.26 mi (1,262.14 km) |
| Watford to Campobasso | 994.81 mi (1,600.99 km) |
| Watford to Campobello di Licata | 1,215.48 mi (1,956.12 km) |
| Watford to Campobello di Mazara | 1,160.64 mi (1,867.86 km) |
