| Porsgrunn to Lagoa | 2,145.65 mi (3,453.08 km) |
| Porsgrunn to Lagos | 1,728.26 mi (2,781.36 km) |
| Porsgrunn to Lamego | 1,456.99 mi (2,344.80 km) |
| Porsgrunn to Leiria | 1,563.61 mi (2,516.39 km) |
| Porsgrunn to Lisbon | 1,635.75 mi (2,632.49 km) |
| Porsgrunn to Loule | 1,711.23 mi (2,753.96 km) |
| Porsgrunn to Loures | 1,629.34 mi (2,622.16 km) |
| Porsgrunn to Lourinha | 1,607.24 mi (2,586.61 km) |
| Porsgrunn to Lousa | 1,528.54 mi (2,459.95 km) |
| Porsgrunn to Lousada | 1,454.32 mi (2,340.50 km) |
| Porsgrunn to Macedo de Cavaleiros | 1,410.84 mi (2,270.52 km) |
| Porsgrunn to Mafamude | 1,474.13 mi (2,372.38 km) |
| Porsgrunn to Mafra | 1,626.27 mi (2,617.23 km) |
| Porsgrunn to Maia | 1,467.12 mi (2,361.10 km) |
| Porsgrunn to Mangualde | 1,486.97 mi (2,393.04 km) |
