| Slidell to Montalegre | 4,476.38 mi (7,204.04 km) |
| Slidell to Montemor-o-Novo | 4,529.02 mi (7,288.75 km) |
| Slidell to Montemor-o-Velho | 4,470.11 mi (7,193.94 km) |
| Slidell to Montijo | 4,493.60 mi (7,231.75 km) |
| Slidell to Mortagua | 4,486.36 mi (7,220.10 km) |
| Slidell to Moura | 4,580.42 mi (7,371.47 km) |
| Slidell to Murtosa | 4,459.71 mi (7,177.20 km) |
| Slidell to Nazare | 4,463.91 mi (7,183.97 km) |
| Slidell to Nelas | 4,503.42 mi (7,247.56 km) |
| Slidell to Obidos | 4,464.88 mi (7,185.53 km) |
| Slidell to Odemira | 4,533.42 mi (7,295.83 km) |
| Slidell to Odivelas | 4,476.91 mi (7,204.89 km) |
| Slidell to Oeiras | 4,472.45 mi (7,197.71 km) |
| Slidell to Olhao | 4,587.79 mi (7,383.34 km) |
| Slidell to Oliveira de Azemeis | 4,465.12 mi (7,185.91 km) |
