| Letchworth to Benavente | 988.63 mi (1,591.05 km) |
| Letchworth to Bombarral | 976.65 mi (1,571.76 km) |
| Letchworth to Bougado | 833.34 mi (1,341.13 km) |
| Letchworth to Braga | 816.94 mi (1,314.74 km) |
| Letchworth to Braganca | 766.65 mi (1,233.81 km) |
| Letchworth to Cabeceiras de Basto | 809.25 mi (1,302.36 km) |
| Letchworth to Cacem | 1,011.52 mi (1,627.89 km) |
| Letchworth to Cadaval | 977.71 mi (1,573.47 km) |
| Letchworth to Caldas da Rainha | 967.40 mi (1,556.88 km) |
| Letchworth to Calheta | 1,577.98 mi (2,539.51 km) |
| Letchworth to Camara de Lobos | 1,574.83 mi (2,534.44 km) |
| Letchworth to Canico | 1,574.76 mi (2,534.34 km) |
| Letchworth to Cantanhede | 896.45 mi (1,442.69 km) |
| Letchworth to Carregal do Sal | 878.75 mi (1,414.21 km) |
| Letchworth to Cartaxo | 976.55 mi (1,571.60 km) |
