| Houghton Regis to Alenquer | 977.21 mi (1,572.67 km) |
| Houghton Regis to Alfena | 827.98 mi (1,332.50 km) |
| Houghton Regis to Alijo | 804.17 mi (1,294.18 km) |
| Houghton Regis to Aljustrel | 1,034.86 mi (1,665.44 km) |
| Houghton Regis to Almada | 1,003.76 mi (1,615.39 km) |
| Houghton Regis to Almargem | 995.31 mi (1,601.80 km) |
| Houghton Regis to Almeirim | 959.70 mi (1,544.48 km) |
| Houghton Regis to Amadora | 1,001.86 mi (1,612.34 km) |
| Houghton Regis to Amarante | 816.53 mi (1,314.08 km) |
| Houghton Regis to Amares | 800.05 mi (1,287.56 km) |
| Houghton Regis to Amora | 1,006.43 mi (1,619.70 km) |
| Houghton Regis to Anadia | 877.02 mi (1,411.43 km) |
| Houghton Regis to Angra do Heroismo | 1,573.44 mi (2,532.21 km) |
| Houghton Regis to Ansiao | 910.05 mi (1,464.58 km) |
| Houghton Regis to Anta | 844.65 mi (1,359.32 km) |
