| Seclin to Montemor-o-Novo | 988.51 mi (1,590.85 km) |
| Seclin to Montemor-o-Velho | 913.08 mi (1,469.45 km) |
| Seclin to Montijo | 1,005.41 mi (1,618.05 km) |
| Seclin to Mortagua | 884.51 mi (1,423.48 km) |
| Seclin to Moura | 999.77 mi (1,608.97 km) |
| Seclin to Murtosa | 879.50 mi (1,415.42 km) |
| Seclin to Nazare | 956.90 mi (1,539.98 km) |
| Seclin to Nelas | 868.53 mi (1,397.76 km) |
| Seclin to Obidos | 973.51 mi (1,566.70 km) |
| Seclin to Odemira | 1,063.80 mi (1,712.02 km) |
| Seclin to Odivelas | 1,007.10 mi (1,620.77 km) |
| Seclin to Oeiras | 1,017.29 mi (1,637.18 km) |
| Seclin to Olhao | 1,077.66 mi (1,734.32 km) |
| Seclin to Oliveira de Azemeis | 868.68 mi (1,398.01 km) |
| Seclin to Oliveira de Frades | 866.87 mi (1,395.09 km) |
