| Letchworth to Lagoa | 1,100.93 mi (1,771.78 km) |
| Letchworth to Lagoa | 1,569.67 mi (2,526.14 km) |
| Letchworth to Lagos | 1,106.90 mi (1,781.39 km) |
| Letchworth to Lamego | 832.35 mi (1,339.53 km) |
| Letchworth to Leiria | 938.59 mi (1,510.52 km) |
| Letchworth to Lisbon | 1,011.16 mi (1,627.30 km) |
| Letchworth to Loule | 1,092.07 mi (1,757.52 km) |
| Letchworth to Loures | 1,004.59 mi (1,616.74 km) |
| Letchworth to Lourinha | 981.90 mi (1,580.22 km) |
| Letchworth to Lousa | 904.19 mi (1,455.16 km) |
| Letchworth to Lousada | 828.71 mi (1,333.67 km) |
| Letchworth to Macedo de Cavaleiros | 787.68 mi (1,267.65 km) |
| Letchworth to Mafamude | 848.20 mi (1,365.05 km) |
| Letchworth to Mafra | 1,001.14 mi (1,611.18 km) |
| Letchworth to Maia | 841.10 mi (1,353.62 km) |
