| Irthlingborough to Oliveira de Frades | 877.87 mi (1,412.80 km) |
| Irthlingborough to Oliveira do Bairro | 896.85 mi (1,443.35 km) |
| Irthlingborough to Oliveira do Hospital | 895.00 mi (1,440.37 km) |
| Irthlingborough to Ourem | 953.92 mi (1,535.18 km) |
| Irthlingborough to Ovar | 877.15 mi (1,411.64 km) |
| Irthlingborough to Pacos de Ferreira | 846.96 mi (1,363.05 km) |
| Irthlingborough to Palmela | 1,030.30 mi (1,658.11 km) |
| Irthlingborough to Paredes | 849.87 mi (1,367.73 km) |
| Irthlingborough to Paredes de Coura | 809.49 mi (1,302.75 km) |
| Irthlingborough to Penacova | 908.51 mi (1,462.10 km) |
| Irthlingborough to Penafiel | 848.50 mi (1,365.53 km) |
| Irthlingborough to Peniche | 988.80 mi (1,591.32 km) |
| Irthlingborough to Peso da Regua | 841.28 mi (1,353.90 km) |
| Irthlingborough to Pinhal Novo | 1,026.39 mi (1,651.82 km) |
| Irthlingborough to Pinhel | 853.45 mi (1,373.50 km) |
