| Northolt to Noventa Vicentina | 695.15 mi (1,118.74 km) |
| Northolt to Novi di Modena | 691.82 mi (1,113.38 km) |
| Northolt to Novi Ligure | 629.96 mi (1,013.82 km) |
| Northolt to Nuoro | 903.48 mi (1,454.01 km) |
| Northolt to Occhiobello | 714.03 mi (1,149.12 km) |
| Northolt to Oderzo | 707.84 mi (1,139.15 km) |
| Northolt to Oggiono | 595.18 mi (957.85 km) |
| Northolt to Olbia | 871.18 mi (1,402.02 km) |
| Northolt to Oleggio | 580.77 mi (934.67 km) |
| Northolt to Olgiate Comasco | 582.35 mi (937.20 km) |
| Northolt to Olgiate Olona | 587.18 mi (944.97 km) |
| Northolt to Omegna | 559.19 mi (899.94 km) |
| Northolt to Opera | 610.82 mi (983.02 km) |
| Northolt to Oppeano | 681.94 mi (1,097.47 km) |
| Northolt to Orbassano | 579.26 mi (932.23 km) |
