| Rietberg to Montemor-o-Novo | 1,211.61 mi (1,949.90 km) |
| Rietberg to Montemor-o-Velho | 1,144.11 mi (1,841.27 km) |
| Rietberg to Montijo | 1,231.69 mi (1,982.22 km) |
| Rietberg to Mortagua | 1,114.80 mi (1,794.09 km) |
| Rietberg to Moura | 1,217.03 mi (1,958.62 km) |
| Rietberg to Murtosa | 1,112.55 mi (1,790.47 km) |
| Rietberg to Nazare | 1,187.28 mi (1,910.74 km) |
| Rietberg to Nelas | 1,097.54 mi (1,766.32 km) |
| Rietberg to Obidos | 1,203.35 mi (1,936.60 km) |
| Rietberg to Odemira | 1,284.83 mi (2,067.73 km) |
| Rietberg to Odivelas | 1,234.94 mi (1,987.45 km) |
| Rietberg to Oeiras | 1,245.31 mi (2,004.12 km) |
| Rietberg to Olhao | 1,292.71 mi (2,080.41 km) |
| Rietberg to Oliveira de Azemeis | 1,101.55 mi (1,772.77 km) |
| Rietberg to Oliveira de Frades | 1,098.10 mi (1,767.22 km) |
