| Houghton Regis to Montalegre | 775.61 mi (1,248.22 km) |
| Houghton Regis to Montemor-o-Novo | 987.84 mi (1,589.77 km) |
| Houghton Regis to Montemor-o-Velho | 899.11 mi (1,446.98 km) |
| Houghton Regis to Montijo | 998.48 mi (1,606.91 km) |
| Houghton Regis to Mortagua | 873.00 mi (1,404.96 km) |
| Houghton Regis to Moura | 1,008.66 mi (1,623.28 km) |
| Houghton Regis to Murtosa | 862.12 mi (1,387.44 km) |
| Houghton Regis to Nazare | 943.09 mi (1,517.75 km) |
| Houghton Regis to Nelas | 860.16 mi (1,384.30 km) |
| Houghton Regis to Obidos | 960.38 mi (1,545.58 km) |
| Houghton Regis to Odemira | 1,064.88 mi (1,713.76 km) |
| Houghton Regis to Odivelas | 997.13 mi (1,604.72 km) |
| Houghton Regis to Oeiras | 1,006.74 mi (1,620.20 km) |
| Houghton Regis to Olhao | 1,088.08 mi (1,751.10 km) |
| Houghton Regis to Oliveira de Azemeis | 852.04 mi (1,371.23 km) |
