| Houghton Regis to Olivares | 1,037.66 mi (1,669.95 km) |
| Houghton Regis to Olivenza | 966.61 mi (1,555.61 km) |
| Houghton Regis to Olot | 686.37 mi (1,104.60 km) |
| Houghton Regis to Onate | 619.18 mi (996.47 km) |
| Houghton Regis to Onda | 825.16 mi (1,327.97 km) |
| Houghton Regis to Onteniente | 903.87 mi (1,454.63 km) |
| Houghton Regis to Orihuela | 954.97 mi (1,536.88 km) |
| Houghton Regis to Osuna | 1,037.83 mi (1,670.22 km) |
| Houghton Regis to Ourense | 744.78 mi (1,198.61 km) |
| Houghton Regis to Oviedo | 639.77 mi (1,029.61 km) |
| Houghton Regis to Paiporta | 862.03 mi (1,387.30 km) |
| Houghton Regis to Pajara | 1,771.70 mi (2,851.27 km) |
| Houghton Regis to Palafolls | 723.73 mi (1,164.73 km) |
| Houghton Regis to Palafrugell | 711.37 mi (1,144.85 km) |
| Houghton Regis to Palamos | 715.81 mi (1,151.99 km) |
