| Portet-sur-Garonne to Novi di Modena | 479.41 mi (771.54 km) |
| Portet-sur-Garonne to Novi Ligure | 375.61 mi (604.49 km) |
| Portet-sur-Garonne to Nuoro | 463.54 mi (746.00 km) |
| Portet-sur-Garonne to Occhiobello | 512.66 mi (825.04 km) |
| Portet-sur-Garonne to Oderzo | 566.31 mi (911.39 km) |
| Portet-sur-Garonne to Oggiono | 420.32 mi (676.44 km) |
| Portet-sur-Garonne to Olbia | 451.33 mi (726.34 km) |
| Portet-sur-Garonne to Oleggio | 383.49 mi (617.17 km) |
| Portet-sur-Garonne to Olgiate Comasco | 402.92 mi (648.43 km) |
| Portet-sur-Garonne to Olgiate Olona | 395.66 mi (636.75 km) |
| Portet-sur-Garonne to Omegna | 380.23 mi (611.92 km) |
| Portet-sur-Garonne to Opera | 405.93 mi (653.27 km) |
| Portet-sur-Garonne to Oppeano | 497.61 mi (800.82 km) |
| Portet-sur-Garonne to Orbassano | 320.14 mi (515.22 km) |
| Portet-sur-Garonne to Orbetello | 501.00 mi (806.27 km) |
