| Houghton Regis to Arcos de Valdevez | 787.48 mi (1,267.33 km) |
| Houghton Regis to Arcozelo | 841.92 mi (1,354.94 km) |
| Houghton Regis to Arganil | 883.30 mi (1,421.53 km) |
| Houghton Regis to Arouca | 841.33 mi (1,353.99 km) |
| Houghton Regis to Arruda dos Vinhos | 982.49 mi (1,581.16 km) |
| Houghton Regis to Aveiro | 868.80 mi (1,398.19 km) |
| Houghton Regis to Aver-o-Mar | 822.91 mi (1,324.35 km) |
| Houghton Regis to Aves | 810.45 mi (1,304.29 km) |
| Houghton Regis to Azambuja | 973.16 mi (1,566.15 km) |
| Houghton Regis to Baiao | 822.20 mi (1,323.21 km) |
| Houghton Regis to Barcelos | 812.50 mi (1,307.59 km) |
| Houghton Regis to Barreiro | 1,002.82 mi (1,613.88 km) |
| Houghton Regis to Batalha | 934.45 mi (1,503.84 km) |
| Houghton Regis to Beja | 1,022.37 mi (1,645.34 km) |
| Houghton Regis to Belas | 999.93 mi (1,609.24 km) |
