| Irthlingborough to Lagoa | 1,116.25 mi (1,796.43 km) |
| Irthlingborough to Lagoa | 1,567.22 mi (2,522.20 km) |
| Irthlingborough to Lagos | 1,121.98 mi (1,805.65 km) |
| Irthlingborough to Lamego | 846.06 mi (1,361.61 km) |
| Irthlingborough to Leiria | 951.94 mi (1,531.99 km) |
| Irthlingborough to Lisbon | 1,024.73 mi (1,649.15 km) |
| Irthlingborough to Loule | 1,107.91 mi (1,783.01 km) |
| Irthlingborough to Loures | 1,018.08 mi (1,638.44 km) |
| Irthlingborough to Lourinha | 994.95 mi (1,601.21 km) |
| Irthlingborough to Lousa | 918.03 mi (1,477.43 km) |
| Irthlingborough to Lousada | 841.62 mi (1,354.46 km) |
| Irthlingborough to Macedo de Cavaleiros | 802.33 mi (1,291.23 km) |
| Irthlingborough to Mafamude | 860.74 mi (1,385.23 km) |
| Irthlingborough to Mafra | 1,014.35 mi (1,632.43 km) |
| Irthlingborough to Maia | 853.52 mi (1,373.60 km) |
