| Houghton Regis to Cascais | 1,007.71 mi (1,621.75 km) |
| Houghton Regis to Castelo Branco | 899.05 mi (1,446.88 km) |
| Houghton Regis to Castro Daire | 837.20 mi (1,347.35 km) |
| Houghton Regis to Celorico de Basto | 807.76 mi (1,299.97 km) |
| Houghton Regis to Chamusca | 947.45 mi (1,524.78 km) |
| Houghton Regis to Chaves | 774.37 mi (1,246.23 km) |
| Houghton Regis to Cinfaes | 828.48 mi (1,333.31 km) |
| Houghton Regis to Coimbra | 891.12 mi (1,434.12 km) |
| Houghton Regis to Condeixa-a-Nova | 898.57 mi (1,446.12 km) |
| Houghton Regis to Corroios | 1,007.82 mi (1,621.93 km) |
| Houghton Regis to Coruche | 973.66 mi (1,566.96 km) |
| Houghton Regis to Costa de Caparica | 1,007.59 mi (1,621.56 km) |
| Houghton Regis to Covilha | 868.71 mi (1,398.06 km) |
| Houghton Regis to Eiras | 889.04 mi (1,430.76 km) |
| Houghton Regis to Elvas | 955.45 mi (1,537.65 km) |
