| Watford to Ames | 716.64 mi (1,153.33 km) |
| Watford to Amorebieta | 592.93 mi (954.23 km) |
| Watford to Amposta | 757.61 mi (1,219.25 km) |
| Watford to Amurrio | 606.63 mi (976.28 km) |
| Watford to Andoain | 587.89 mi (946.12 km) |
| Watford to Andraitx | 845.53 mi (1,360.75 km) |
| Watford to Andujar | 957.33 mi (1,540.67 km) |
| Watford to Antequera | 1,031.58 mi (1,660.17 km) |
| Watford to Antigua | 1,753.16 mi (2,821.44 km) |
| Watford to Aranda de Duero | 706.20 mi (1,136.51 km) |
| Watford to Aranjuez | 817.47 mi (1,315.59 km) |
| Watford to Archena | 936.55 mi (1,507.23 km) |
| Watford to Arcos de la Frontera | 1,063.31 mi (1,711.24 km) |
| Watford to Arenys de Mar | 709.73 mi (1,142.20 km) |
| Watford to Arenys de Munt | 707.54 mi (1,138.67 km) |
