| Houston to Cascais | 4,768.25 mi (7,673.75 km) |
| Houston to Castelo Branco | 4,833.86 mi (7,779.34 km) |
| Houston to Castro Daire | 4,784.35 mi (7,699.66 km) |
| Houston to Celorico de Basto | 4,768.68 mi (7,674.44 km) |
| Houston to Chamusca | 4,797.76 mi (7,721.24 km) |
| Houston to Chaves | 4,784.84 mi (7,700.46 km) |
| Houston to Cinfaes | 4,769.52 mi (7,675.79 km) |
| Houston to Coimbra | 4,778.03 mi (7,689.49 km) |
| Houston to Condeixa-a-Nova | 4,777.00 mi (7,687.84 km) |
| Houston to Corroios | 4,783.76 mi (7,698.71 km) |
| Houston to Coruche | 4,805.90 mi (7,734.35 km) |
| Houston to Costa de Caparica | 4,778.74 mi (7,690.64 km) |
| Houston to Covilha | 4,821.51 mi (7,759.47 km) |
| Houston to Eiras | 4,777.48 mi (7,688.61 km) |
| Houston to Elvas | 4,876.59 mi (7,848.11 km) |
