| Big Spring to Montalegre | 4,949.05 mi (7,964.73 km) |
| Big Spring to Montemor-o-Novo | 5,030.56 mi (8,095.90 km) |
| Big Spring to Montemor-o-Velho | 4,960.02 mi (7,982.38 km) |
| Big Spring to Montijo | 4,996.85 mi (8,041.66 km) |
| Big Spring to Mortagua | 4,972.65 mi (8,002.70 km) |
| Big Spring to Moura | 5,084.01 mi (8,181.92 km) |
| Big Spring to Murtosa | 4,944.50 mi (7,957.41 km) |
| Big Spring to Nazare | 4,959.82 mi (7,982.07 km) |
| Big Spring to Nelas | 4,987.87 mi (8,027.19 km) |
| Big Spring to Obidos | 4,963.14 mi (7,987.40 km) |
| Big Spring to Odemira | 5,045.06 mi (8,119.23 km) |
| Big Spring to Odivelas | 4,980.07 mi (8,014.64 km) |
| Big Spring to Oeiras | 4,976.90 mi (8,009.55 km) |
| Big Spring to Olhao | 5,101.63 mi (8,210.28 km) |
| Big Spring to Oliveira de Azemeis | 4,948.52 mi (7,963.87 km) |
