| Houghton Regis to Nasaud | 1,154.90 mi (1,858.63 km) |
| Houghton Regis to Navodari | 1,430.79 mi (2,302.63 km) |
| Houghton Regis to Negresti-Oas | 1,096.44 mi (1,764.55 km) |
| Houghton Regis to Nehoiu | 1,297.13 mi (2,087.53 km) |
| Houghton Regis to Ocna Mures | 1,159.52 mi (1,866.07 km) |
| Houghton Regis to Odobesti | 1,315.17 mi (2,116.56 km) |
| Houghton Regis to Odorheiu Secuiesc | 1,222.72 mi (1,967.78 km) |
| Houghton Regis to Oltenita | 1,356.84 mi (2,183.62 km) |
| Houghton Regis to Onesti | 1,286.52 mi (2,070.46 km) |
| Houghton Regis to Oradea | 1,056.31 mi (1,699.97 km) |
| Houghton Regis to Orastie | 1,149.97 mi (1,850.69 km) |
| Houghton Regis to Oravita | 1,116.57 mi (1,796.94 km) |
| Houghton Regis to Orsova | 1,157.60 mi (1,862.98 km) |
| Houghton Regis to Otelu Rosu | 1,126.43 mi (1,812.81 km) |
| Houghton Regis to Otopeni | 1,315.99 mi (2,117.88 km) |
