| Portales to Noventa Vicentina | 5,605.64 mi (9,021.41 km) |
| Portales to Novi di Modena | 5,599.61 mi (9,011.70 km) |
| Portales to Novi Ligure | 5,525.60 mi (8,892.59 km) |
| Portales to Nuoro | 5,741.75 mi (9,240.45 km) |
| Portales to Occhiobello | 5,623.68 mi (9,050.44 km) |
| Portales to Oderzo | 5,618.28 mi (9,041.75 km) |
| Portales to Oggiono | 5,502.38 mi (8,855.22 km) |
| Portales to Olbia | 5,721.95 mi (9,208.59 km) |
| Portales to Oleggio | 5,483.41 mi (8,824.70 km) |
| Portales to Olgiate Comasco | 5,488.03 mi (8,832.12 km) |
| Portales to Olgiate Olona | 5,491.39 mi (8,837.55 km) |
| Portales to Omegna | 5,462.90 mi (8,791.68 km) |
| Portales to Opera | 5,514.81 mi (8,875.23 km) |
| Portales to Oppeano | 5,591.95 mi (8,999.37 km) |
| Portales to Orbassano | 5,467.08 mi (8,798.42 km) |
