| Letchworth to Montalegre | 786.23 mi (1,265.31 km) |
| Letchworth to Montemor-o-Novo | 997.85 mi (1,605.89 km) |
| Letchworth to Montemor-o-Velho | 909.70 mi (1,464.02 km) |
| Letchworth to Montijo | 1,008.82 mi (1,623.53 km) |
| Letchworth to Mortagua | 883.45 mi (1,421.77 km) |
| Letchworth to Moura | 1,018.19 mi (1,638.62 km) |
| Letchworth to Murtosa | 872.83 mi (1,404.69 km) |
| Letchworth to Nazare | 953.71 mi (1,534.84 km) |
| Letchworth to Nelas | 870.44 mi (1,400.84 km) |
| Letchworth to Obidos | 970.98 mi (1,562.64 km) |
| Letchworth to Odemira | 1,074.86 mi (1,729.83 km) |
| Letchworth to Odivelas | 1,007.61 mi (1,621.59 km) |
| Letchworth to Oeiras | 1,017.26 mi (1,637.12 km) |
| Letchworth to Olhao | 1,097.59 mi (1,766.40 km) |
| Letchworth to Oliveira de Azemeis | 862.71 mi (1,388.40 km) |
