| Big Spring to Oliveira de Frades | 4,965.98 mi (7,991.98 km) |
| Big Spring to Oliveira do Bairro | 4,957.55 mi (7,978.40 km) |
| Big Spring to Oliveira do Hospital | 4,992.33 mi (8,034.38 km) |
| Big Spring to Ourem | 4,981.89 mi (8,017.57 km) |
| Big Spring to Ovar | 4,940.31 mi (7,950.66 km) |
| Big Spring to Pacos de Ferreira | 4,938.58 mi (7,947.87 km) |
| Big Spring to Palmela | 5,000.58 mi (8,047.65 km) |
| Big Spring to Paredes | 4,943.76 mi (7,956.21 km) |
| Big Spring to Paredes de Coura | 4,910.91 mi (7,903.35 km) |
| Big Spring to Penacova | 4,975.48 mi (8,007.26 km) |
| Big Spring to Penafiel | 4,945.85 mi (7,959.58 km) |
| Big Spring to Peniche | 4,953.46 mi (7,971.82 km) |
| Big Spring to Peso da Regua | 4,970.60 mi (7,999.41 km) |
| Big Spring to Pinhal Novo | 4,997.85 mi (8,043.27 km) |
| Big Spring to Pinhel | 5,015.65 mi (8,071.90 km) |
