| Watford to Cascais | 995.35 mi (1,601.86 km) |
| Watford to Castelo Branco | 885.77 mi (1,425.52 km) |
| Watford to Castro Daire | 824.64 mi (1,327.13 km) |
| Watford to Celorico de Basto | 795.47 mi (1,280.18 km) |
| Watford to Chamusca | 934.70 mi (1,504.25 km) |
| Watford to Chaves | 761.82 mi (1,226.03 km) |
| Watford to Cinfaes | 816.16 mi (1,313.49 km) |
| Watford to Coimbra | 878.65 mi (1,414.04 km) |
| Watford to Condeixa-a-Nova | 886.11 mi (1,426.06 km) |
| Watford to Corroios | 995.26 mi (1,601.72 km) |
| Watford to Coruche | 960.80 mi (1,546.26 km) |
| Watford to Costa de Caparica | 995.10 mi (1,601.45 km) |
| Watford to Covilha | 855.60 mi (1,376.95 km) |
| Watford to Eiras | 876.57 mi (1,410.70 km) |
| Watford to Elvas | 941.67 mi (1,515.47 km) |
