| Helensburgh to Lagoa | 1,316.13 mi (2,118.10 km) |
| Helensburgh to Lagoa | 1,587.50 mi (2,554.84 km) |
| Helensburgh to Lagos | 1,319.62 mi (2,123.72 km) |
| Helensburgh to Lamego | 1,039.88 mi (1,673.52 km) |
| Helensburgh to Leiria | 1,139.11 mi (1,833.21 km) |
| Helensburgh to Lisbon | 1,211.84 mi (1,950.27 km) |
| Helensburgh to Loule | 1,312.39 mi (2,112.09 km) |
| Helensburgh to Loures | 1,204.59 mi (1,938.59 km) |
| Helensburgh to Lourinha | 1,178.31 mi (1,896.31 km) |
| Helensburgh to Lousa | 1,110.42 mi (1,787.04 km) |
| Helensburgh to Lousada | 1,029.00 mi (1,656.01 km) |
| Helensburgh to Macedo de Cavaleiros | 1,005.31 mi (1,617.88 km) |
| Helensburgh to Mafamude | 1,044.27 mi (1,680.59 km) |
| Helensburgh to Mafra | 1,198.53 mi (1,928.84 km) |
| Helensburgh to Maia | 1,036.30 mi (1,667.76 km) |
