| South Houston to Oliveira de Frades | 4,774.24 mi (7,683.39 km) |
| South Houston to Oliveira do Bairro | 4,763.91 mi (7,666.77 km) |
| South Houston to Oliveira do Hospital | 4,799.08 mi (7,723.38 km) |
| South Houston to Ourem | 4,782.84 mi (7,697.23 km) |
| South Houston to Ovar | 4,748.54 mi (7,642.03 km) |
| South Houston to Pacos de Ferreira | 4,749.76 mi (7,644.00 km) |
| South Houston to Palmela | 4,794.31 mi (7,715.70 km) |
| South Houston to Paredes | 4,754.67 mi (7,651.90 km) |
| South Houston to Paredes de Coura | 4,725.77 mi (7,605.39 km) |
| South Houston to Penacova | 4,780.80 mi (7,693.95 km) |
| South Houston to Penafiel | 4,756.90 mi (7,655.49 km) |
| South Houston to Peniche | 4,750.90 mi (7,645.83 km) |
| South Houston to Peso da Regua | 4,782.47 mi (7,696.64 km) |
| South Houston to Pinhal Novo | 4,791.94 mi (7,711.89 km) |
| South Houston to Pinhel | 4,826.69 mi (7,767.81 km) |
