| Houghton Regis to Ondokuzmayis | 1,853.33 mi (2,982.65 km) |
| Houghton Regis to Ordu | 1,950.11 mi (3,138.40 km) |
| Houghton Regis to Ortahisar | 1,924.18 mi (3,096.67 km) |
| Houghton Regis to Ortakent | 1,692.82 mi (2,724.33 km) |
| Houghton Regis to Ortaklar | 1,662.47 mi (2,675.49 km) |
| Houghton Regis to Ortakoy | 1,884.94 mi (3,033.52 km) |
| Houghton Regis to Ortakoy | 1,868.93 mi (3,007.75 km) |
| Houghton Regis to Osmaneli | 1,648.91 mi (2,653.66 km) |
| Houghton Regis to Osmaniye | 2,051.26 mi (3,301.18 km) |
| Houghton Regis to Ozdere | 1,641.55 mi (2,641.83 km) |
| Houghton Regis to Palu | 2,132.79 mi (3,432.39 km) |
| Houghton Regis to Pamukkale | 1,724.09 mi (2,774.65 km) |
| Houghton Regis to Patnos | 2,233.43 mi (3,594.36 km) |
| Houghton Regis to Pazar | 1,913.63 mi (3,079.69 km) |
| Houghton Regis to Pazarcik | 2,075.72 mi (3,340.55 km) |
