| Houghton Regis to Nottingham | 77.14 mi (124.15 km) |
| Houghton Regis to Nuneaton | 58.52 mi (94.18 km) |
| Houghton Regis to Oadby | 53.38 mi (85.90 km) |
| Houghton Regis to Oakengates | 98.04 mi (157.78 km) |
| Houghton Regis to Oakham | 53.70 mi (86.41 km) |
| Houghton Regis to Oldbury | 75.57 mi (121.63 km) |
| Houghton Regis to Oldham | 131.47 mi (211.58 km) |
| Houghton Regis to Ollerton | 91.94 mi (147.96 km) |
| Houghton Regis to Olton | 65.63 mi (105.62 km) |
| Houghton Regis to Omagh | 335.45 mi (539.85 km) |
| Houghton Regis to Ormesby | 184.78 mi (297.37 km) |
| Houghton Regis to Ormskirk | 151.52 mi (243.84 km) |
| Houghton Regis to Orpington | 45.32 mi (72.94 km) |
| Houghton Regis to Ossett | 130.39 mi (209.85 km) |
| Houghton Regis to Oswaldtwistle | 149.09 mi (239.94 km) |
