| Belfast to Montalegre | 886.62 mi (1,426.88 km) |
| Belfast to Montemor-o-Novo | 1,106.97 mi (1,781.49 km) |
| Belfast to Montemor-o-Velho | 1,005.08 mi (1,617.52 km) |
| Belfast to Montijo | 1,108.23 mi (1,783.52 km) |
| Belfast to Mortagua | 984.32 mi (1,584.11 km) |
| Belfast to Moura | 1,139.73 mi (1,834.21 km) |
| Belfast to Murtosa | 965.89 mi (1,554.44 km) |
| Belfast to Nazare | 1,046.33 mi (1,683.91 km) |
| Belfast to Nelas | 976.83 mi (1,572.05 km) |
| Belfast to Obidos | 1,063.52 mi (1,711.56 km) |
| Belfast to Odemira | 1,182.38 mi (1,902.86 km) |
| Belfast to Odivelas | 1,102.60 mi (1,774.46 km) |
| Belfast to Oeiras | 1,110.84 mi (1,787.72 km) |
| Belfast to Olhao | 1,217.37 mi (1,959.16 km) |
| Belfast to Oliveira de Azemeis | 957.65 mi (1,541.18 km) |
