| Olgiate Olona to Montemor-o-Novo | 997.21 mi (1,604.86 km) |
| Olgiate Olona to Montemor-o-Velho | 963.40 mi (1,550.45 km) |
| Olgiate Olona to Montijo | 1,026.49 mi (1,651.97 km) |
| Olgiate Olona to Mortagua | 933.77 mi (1,502.76 km) |
| Olgiate Olona to Moura | 984.31 mi (1,584.10 km) |
| Olgiate Olona to Murtosa | 942.78 mi (1,517.27 km) |
| Olgiate Olona to Nazare | 1,000.45 mi (1,610.07 km) |
| Olgiate Olona to Nelas | 913.30 mi (1,469.81 km) |
| Olgiate Olona to Obidos | 1,013.19 mi (1,630.57 km) |
| Olgiate Olona to Odemira | 1,058.72 mi (1,703.85 km) |
| Olgiate Olona to Odivelas | 1,035.03 mi (1,665.72 km) |
| Olgiate Olona to Oeiras | 1,045.25 mi (1,682.17 km) |
| Olgiate Olona to Olhao | 1,048.60 mi (1,687.56 km) |
| Olgiate Olona to Oliveira de Azemeis | 932.07 mi (1,500.03 km) |
| Olgiate Olona to Oliveira de Frades | 922.32 mi (1,484.34 km) |
