| Seclin to Lagoa | 1,655.78 mi (2,664.72 km) |
| Seclin to Lagos | 1,094.00 mi (1,760.62 km) |
| Seclin to Lamego | 833.95 mi (1,342.11 km) |
| Seclin to Leiria | 940.40 mi (1,513.43 km) |
| Seclin to Lisbon | 1,010.05 mi (1,625.52 km) |
| Seclin to Loule | 1,073.94 mi (1,728.35 km) |
| Seclin to Loures | 1,004.21 mi (1,616.13 km) |
| Seclin to Lourinha | 984.89 mi (1,585.03 km) |
| Seclin to Lousa | 903.35 mi (1,453.80 km) |
| Seclin to Lousada | 835.77 mi (1,345.04 km) |
| Seclin to Macedo de Cavaleiros | 784.05 mi (1,261.81 km) |
| Seclin to Mafamude | 857.27 mi (1,379.65 km) |
| Seclin to Mafra | 1,002.73 mi (1,613.73 km) |
| Seclin to Maia | 851.15 mi (1,369.79 km) |
| Seclin to Mangualde | 860.91 mi (1,385.50 km) |
