| Oud-Heverlee to Montemor-o-Novo | 1,049.56 mi (1,689.10 km) |
| Oud-Heverlee to Montemor-o-Velho | 977.35 mi (1,572.89 km) |
| Oud-Heverlee to Montijo | 1,067.79 mi (1,718.44 km) |
| Oud-Heverlee to Mortagua | 948.43 mi (1,526.35 km) |
| Oud-Heverlee to Moura | 1,058.48 mi (1,703.46 km) |
| Oud-Heverlee to Murtosa | 944.60 mi (1,520.19 km) |
| Oud-Heverlee to Nazare | 1,020.94 mi (1,643.04 km) |
| Oud-Heverlee to Nelas | 931.88 mi (1,499.72 km) |
| Oud-Heverlee to Obidos | 1,037.33 mi (1,669.42 km) |
| Oud-Heverlee to Odemira | 1,124.11 mi (1,809.07 km) |
| Oud-Heverlee to Odivelas | 1,070.12 mi (1,722.20 km) |
| Oud-Heverlee to Oeiras | 1,080.40 mi (1,738.73 km) |
| Oud-Heverlee to Olhao | 1,135.61 mi (1,827.59 km) |
| Oud-Heverlee to Oliveira de Azemeis | 933.70 mi (1,502.64 km) |
| Oud-Heverlee to Oliveira de Frades | 931.17 mi (1,498.57 km) |
