| Letchworth to Cascais | 1,018.27 mi (1,638.74 km) |
| Letchworth to Castelo Branco | 908.98 mi (1,462.85 km) |
| Letchworth to Castro Daire | 847.63 mi (1,364.12 km) |
| Letchworth to Celorico de Basto | 818.36 mi (1,317.02 km) |
| Letchworth to Chamusca | 957.75 mi (1,541.35 km) |
| Letchworth to Chaves | 784.80 mi (1,263.01 km) |
| Letchworth to Cinfaes | 839.06 mi (1,350.34 km) |
| Letchworth to Coimbra | 901.60 mi (1,450.99 km) |
| Letchworth to Condeixa-a-Nova | 909.07 mi (1,463.00 km) |
| Letchworth to Corroios | 1,018.25 mi (1,638.72 km) |
| Letchworth to Coruche | 983.89 mi (1,583.41 km) |
| Letchworth to Costa de Caparica | 1,018.06 mi (1,638.42 km) |
| Letchworth to Covilha | 878.75 mi (1,414.22 km) |
| Letchworth to Eiras | 899.52 mi (1,447.64 km) |
| Letchworth to Elvas | 964.98 mi (1,552.99 km) |
