| Houghton Regis to Sesimbra | 1,017.82 mi (1,638.02 km) |
| Houghton Regis to Setubal | 1,008.60 mi (1,623.18 km) |
| Houghton Regis to Sever do Vouga | 856.57 mi (1,378.51 km) |
| Houghton Regis to Silves | 1,087.41 mi (1,750.02 km) |
| Houghton Regis to Sines | 1,044.94 mi (1,681.66 km) |
| Houghton Regis to Sintra | 1,000.79 mi (1,610.61 km) |
| Houghton Regis to Sobrado de Paiva | 835.46 mi (1,344.54 km) |
| Houghton Regis to Sobral de Monte Agraco | 981.98 mi (1,580.35 km) |
| Houghton Regis to Soure | 905.53 mi (1,457.30 km) |
| Houghton Regis to Tabua | 873.67 mi (1,406.04 km) |
| Houghton Regis to Tavira | 1,079.06 mi (1,736.57 km) |
| Houghton Regis to Tomar | 930.07 mi (1,496.80 km) |
| Houghton Regis to Tondela | 864.69 mi (1,391.59 km) |
| Houghton Regis to Torre de Moncorvo | 802.66 mi (1,291.75 km) |
| Houghton Regis to Torres Novas | 940.91 mi (1,514.25 km) |
