| Grefrath to Oliveira do Bairro | 1,029.44 mi (1,656.72 km) |
| Grefrath to Oliveira do Hospital | 1,017.51 mi (1,637.52 km) |
| Grefrath to Ourem | 1,079.06 mi (1,736.57 km) |
| Grefrath to Ovar | 1,015.04 mi (1,633.55 km) |
| Grefrath to Pacos de Ferreira | 986.03 mi (1,586.87 km) |
| Grefrath to Palmela | 1,150.21 mi (1,851.09 km) |
| Grefrath to Paredes | 987.34 mi (1,588.96 km) |
| Grefrath to Paredes de Coura | 957.93 mi (1,541.63 km) |
| Grefrath to Penacova | 1,035.81 mi (1,666.97 km) |
| Grefrath to Penafiel | 985.38 mi (1,585.81 km) |
| Grefrath to Peniche | 1,121.26 mi (1,804.49 km) |
| Grefrath to Peso da Regua | 970.81 mi (1,562.38 km) |
| Grefrath to Pinhal Novo | 1,147.01 mi (1,845.93 km) |
| Grefrath to Pinhel | 968.98 mi (1,559.43 km) |
| Grefrath to Pombal | 1,066.33 mi (1,716.10 km) |
