| Watford to Granada | 1,012.43 mi (1,629.35 km) |
| Watford to Granadilla de Abona | 1,829.50 mi (2,944.30 km) |
| Watford to Granollers | 705.62 mi (1,135.58 km) |
| Watford to Grinon | 807.31 mi (1,299.24 km) |
| Watford to Guadalajara | 772.82 mi (1,243.73 km) |
| Watford to Guadarrama | 778.84 mi (1,253.42 km) |
| Watford to Guadix | 1,000.79 mi (1,610.61 km) |
| Watford to Guardamar del Segura | 937.36 mi (1,508.53 km) |
| Watford to Guernica y Luno | 585.72 mi (942.62 km) |
| Watford to Guia de Isora | 1,828.14 mi (2,942.11 km) |
| Watford to Guillena | 1,013.83 mi (1,631.59 km) |
| Watford to Guimar | 1,812.79 mi (2,917.40 km) |
| Watford to Hellin | 909.90 mi (1,464.34 km) |
| Watford to Herencia | 860.84 mi (1,385.39 km) |
| Watford to Hernani | 584.17 mi (940.12 km) |
