| Huntsville to Montalegre | 4,154.37 mi (6,685.81 km) |
| Huntsville to Montemor-o-Novo | 4,216.66 mi (6,786.06 km) |
| Huntsville to Montemor-o-Velho | 4,153.58 mi (6,684.55 km) |
| Huntsville to Montijo | 4,181.79 mi (6,729.94 km) |
| Huntsville to Mortagua | 4,168.66 mi (6,708.82 km) |
| Huntsville to Moura | 4,268.91 mi (6,870.15 km) |
| Huntsville to Murtosa | 4,141.47 mi (6,665.04 km) |
| Huntsville to Nazare | 4,149.43 mi (6,677.85 km) |
| Huntsville to Nelas | 4,185.16 mi (6,735.36 km) |
| Huntsville to Obidos | 4,151.22 mi (6,680.75 km) |
| Huntsville to Odemira | 4,224.82 mi (6,799.20 km) |
| Huntsville to Odivelas | 4,165.04 mi (6,702.98 km) |
| Huntsville to Oeiras | 4,161.04 mi (6,696.54 km) |
| Huntsville to Olhao | 4,280.16 mi (6,888.24 km) |
| Huntsville to Oliveira de Azemeis | 4,146.43 mi (6,673.04 km) |
