| Ostrow Wielkopolski to Montemor-o-Novo | 1,540.80 mi (2,479.68 km) |
| Ostrow Wielkopolski to Montemor-o-Velho | 1,488.18 mi (2,395.00 km) |
| Ostrow Wielkopolski to Montijo | 1,565.78 mi (2,519.87 km) |
| Ostrow Wielkopolski to Mortagua | 1,458.20 mi (2,346.75 km) |
| Ostrow Wielkopolski to Moura | 1,536.56 mi (2,472.85 km) |
| Ostrow Wielkopolski to Murtosa | 1,460.75 mi (2,350.85 km) |
| Ostrow Wielkopolski to Nazare | 1,529.34 mi (2,461.24 km) |
| Ostrow Wielkopolski to Nelas | 1,439.20 mi (2,316.16 km) |
| Ostrow Wielkopolski to Obidos | 1,544.15 mi (2,485.07 km) |
| Ostrow Wielkopolski to Odemira | 1,608.86 mi (2,589.22 km) |
| Ostrow Wielkopolski to Odivelas | 1,571.64 mi (2,529.31 km) |
| Ostrow Wielkopolski to Oeiras | 1,582.09 mi (2,546.12 km) |
| Ostrow Wielkopolski to Olhao | 1,606.70 mi (2,585.74 km) |
| Ostrow Wielkopolski to Oliveira de Azemeis | 1,449.67 mi (2,333.01 km) |
| Ostrow Wielkopolski to Oliveira de Frades | 1,443.48 mi (2,323.05 km) |
