| Grefrath to Montemor-o-Novo | 1,124.56 mi (1,809.80 km) |
| Grefrath to Montemor-o-Velho | 1,054.41 mi (1,696.90 km) |
| Grefrath to Montijo | 1,143.62 mi (1,840.48 km) |
| Grefrath to Mortagua | 1,025.30 mi (1,650.06 km) |
| Grefrath to Moura | 1,131.91 mi (1,821.64 km) |
| Grefrath to Murtosa | 1,022.17 mi (1,645.02 km) |
| Grefrath to Nazare | 1,097.83 mi (1,766.78 km) |
| Grefrath to Nelas | 1,008.43 mi (1,622.92 km) |
| Grefrath to Obidos | 1,114.08 mi (1,792.94 km) |
| Grefrath to Odemira | 1,198.55 mi (1,928.88 km) |
| Grefrath to Odivelas | 1,146.36 mi (1,844.89 km) |
| Grefrath to Oeiras | 1,156.68 mi (1,861.49 km) |
| Grefrath to Olhao | 1,208.43 mi (1,944.78 km) |
| Grefrath to Oliveira de Azemeis | 1,011.22 mi (1,627.40 km) |
| Grefrath to Oliveira de Frades | 1,008.28 mi (1,622.68 km) |
