| Heerlen to Montemor-o-Novo | 1,091.38 mi (1,756.41 km) |
| Heerlen to Montemor-o-Velho | 1,022.18 mi (1,645.04 km) |
| Heerlen to Montijo | 1,110.77 mi (1,787.61 km) |
| Heerlen to Mortagua | 992.98 mi (1,598.04 km) |
| Heerlen to Moura | 1,098.24 mi (1,767.44 km) |
| Heerlen to Murtosa | 990.25 mi (1,593.65 km) |
| Heerlen to Nazare | 1,065.49 mi (1,714.74 km) |
| Heerlen to Nelas | 975.95 mi (1,570.64 km) |
| Heerlen to Obidos | 1,081.67 mi (1,740.78 km) |
| Heerlen to Odemira | 1,165.16 mi (1,875.15 km) |
| Heerlen to Odivelas | 1,113.69 mi (1,792.31 km) |
| Heerlen to Oeiras | 1,124.03 mi (1,808.94 km) |
| Heerlen to Olhao | 1,174.58 mi (1,890.31 km) |
| Heerlen to Oliveira de Azemeis | 979.27 mi (1,575.99 km) |
| Heerlen to Oliveira de Frades | 976.10 mi (1,570.88 km) |
