| Ovada to Montemor-o-Novo | 961.54 mi (1,547.46 km) |
| Ovada to Montemor-o-Velho | 934.41 mi (1,503.79 km) |
| Ovada to Montijo | 992.14 mi (1,596.69 km) |
| Ovada to Mortagua | 905.18 mi (1,456.74 km) |
| Ovada to Moura | 945.42 mi (1,521.50 km) |
| Ovada to Murtosa | 916.13 mi (1,474.37 km) |
| Ovada to Nazare | 969.80 mi (1,560.74 km) |
| Ovada to Nelas | 884.44 mi (1,423.37 km) |
| Ovada to Obidos | 981.76 mi (1,579.99 km) |
| Ovada to Odemira | 1,020.20 mi (1,641.85 km) |
| Ovada to Odivelas | 1,001.54 mi (1,611.83 km) |
| Ovada to Oeiras | 1,011.62 mi (1,628.04 km) |
| Ovada to Olhao | 1,006.91 mi (1,620.46 km) |
| Ovada to Oliveira de Azemeis | 905.64 mi (1,457.49 km) |
| Ovada to Oliveira de Frades | 894.89 mi (1,440.19 km) |
