| Houghton Regis to Noventa Vicentina | 714.57 mi (1,149.99 km) |
| Houghton Regis to Novi di Modena | 712.17 mi (1,146.13 km) |
| Houghton Regis to Novi Ligure | 652.10 mi (1,049.45 km) |
| Houghton Regis to Nuoro | 927.59 mi (1,492.80 km) |
| Houghton Regis to Occhiobello | 733.83 mi (1,180.98 km) |
| Houghton Regis to Oderzo | 725.86 mi (1,168.17 km) |
| Houghton Regis to Oggiono | 615.81 mi (991.06 km) |
| Houghton Regis to Olbia | 895.01 mi (1,440.38 km) |
| Houghton Regis to Oleggio | 602.23 mi (969.20 km) |
| Houghton Regis to Olgiate Comasco | 603.32 mi (970.95 km) |
| Houghton Regis to Olgiate Olona | 608.39 mi (979.11 km) |
| Houghton Regis to Omegna | 580.55 mi (934.30 km) |
| Houghton Regis to Opera | 632.02 mi (1,017.13 km) |
| Houghton Regis to Oppeano | 701.61 mi (1,129.14 km) |
| Houghton Regis to Orbassano | 602.16 mi (969.09 km) |
