| South Portland to Cascais | 3,113.28 mi (5,010.34 km) |
| South Portland to Castelo Branco | 3,170.62 mi (5,102.63 km) |
| South Portland to Castro Daire | 3,117.56 mi (5,017.23 km) |
| South Portland to Celorico de Basto | 3,100.32 mi (4,989.48 km) |
| South Portland to Chamusca | 3,138.01 mi (5,050.15 km) |
| South Portland to Chaves | 3,114.85 mi (5,012.87 km) |
| South Portland to Cinfaes | 3,102.26 mi (4,992.60 km) |
| South Portland to Coimbra | 3,114.48 mi (5,012.28 km) |
| South Portland to Condeixa-a-Nova | 3,113.94 mi (5,011.41 km) |
| South Portland to Corroios | 3,128.74 mi (5,035.23 km) |
| South Portland to Coruche | 3,148.08 mi (5,066.34 km) |
| South Portland to Costa de Caparica | 3,123.73 mi (5,027.15 km) |
| South Portland to Covilha | 3,156.44 mi (5,079.81 km) |
| South Portland to Eiras | 3,113.81 mi (5,011.19 km) |
| South Portland to Elvas | 3,216.87 mi (5,177.06 km) |
