| Houghton Regis to Oliveira de Frades | 853.90 mi (1,374.22 km) |
| Houghton Regis to Oliveira do Bairro | 873.08 mi (1,405.08 km) |
| Houghton Regis to Oliveira do Hospital | 870.56 mi (1,401.03 km) |
| Houghton Regis to Ourem | 929.79 mi (1,496.35 km) |
| Houghton Regis to Ovar | 853.69 mi (1,373.88 km) |
| Houghton Regis to Pacos de Ferreira | 823.50 mi (1,325.29 km) |
| Houghton Regis to Palmela | 1,006.00 mi (1,619.01 km) |
| Houghton Regis to Paredes | 826.30 mi (1,329.80 km) |
| Houghton Regis to Paredes de Coura | 786.60 mi (1,265.91 km) |
| Houghton Regis to Penacova | 884.41 mi (1,423.31 km) |
| Houghton Regis to Penafiel | 824.88 mi (1,327.52 km) |
| Houghton Regis to Peniche | 965.24 mi (1,553.40 km) |
| Houghton Regis to Peso da Regua | 817.14 mi (1,315.06 km) |
| Houghton Regis to Pinhal Novo | 1,002.13 mi (1,612.77 km) |
| Houghton Regis to Pinhel | 828.47 mi (1,333.30 km) |
