| Hilton Head Island to Montalegre | 3,959.87 mi (6,372.80 km) |
| Hilton Head Island to Montemor-o-Novo | 4,001.90 mi (6,440.44 km) |
| Hilton Head Island to Montemor-o-Velho | 3,947.26 mi (6,352.51 km) |
| Hilton Head Island to Montijo | 3,966.06 mi (6,382.75 km) |
| Hilton Head Island to Mortagua | 3,964.74 mi (6,380.63 km) |
| Hilton Head Island to Moura | 4,052.43 mi (6,521.76 km) |
| Hilton Head Island to Murtosa | 3,938.75 mi (6,338.81 km) |
| Hilton Head Island to Nazare | 3,938.98 mi (6,339.17 km) |
| Hilton Head Island to Nelas | 3,982.39 mi (6,409.03 km) |
| Hilton Head Island to Obidos | 3,939.14 mi (6,339.44 km) |
| Hilton Head Island to Odemira | 4,003.01 mi (6,442.23 km) |
| Hilton Head Island to Odivelas | 3,949.47 mi (6,356.06 km) |
| Hilton Head Island to Oeiras | 3,944.59 mi (6,348.21 km) |
| Hilton Head Island to Olhao | 4,056.51 mi (6,528.33 km) |
| Hilton Head Island to Oliveira de Azemeis | 3,944.64 mi (6,348.29 km) |
