| Erkrath to Montemor-o-Novo | 1,136.71 mi (1,829.35 km) |
| Erkrath to Montemor-o-Velho | 1,068.27 mi (1,719.21 km) |
| Erkrath to Montijo | 1,156.41 mi (1,861.06 km) |
| Erkrath to Mortagua | 1,039.02 mi (1,672.13 km) |
| Erkrath to Moura | 1,142.93 mi (1,839.37 km) |
| Erkrath to Murtosa | 1,036.51 mi (1,668.10 km) |
| Erkrath to Nazare | 1,111.52 mi (1,788.82 km) |
| Erkrath to Nelas | 1,021.88 mi (1,644.56 km) |
| Erkrath to Obidos | 1,127.65 mi (1,814.77 km) |
| Erkrath to Odemira | 1,210.24 mi (1,947.70 km) |
| Erkrath to Odivelas | 1,159.48 mi (1,866.00 km) |
| Erkrath to Oeiras | 1,169.82 mi (1,882.65 km) |
| Erkrath to Olhao | 1,219.00 mi (1,961.79 km) |
| Erkrath to Oliveira de Azemeis | 1,025.53 mi (1,650.43 km) |
| Erkrath to Oliveira de Frades | 1,022.22 mi (1,645.10 km) |
