| Helensburgh to Noventa Vicentina | 1,023.54 mi (1,647.23 km) |
| Helensburgh to Novi di Modena | 1,026.59 mi (1,652.14 km) |
| Helensburgh to Novi Ligure | 975.98 mi (1,570.69 km) |
| Helensburgh to Nuoro | 1,258.25 mi (2,024.96 km) |
| Helensburgh to Occhiobello | 1,044.82 mi (1,681.48 km) |
| Helensburgh to Oderzo | 1,026.05 mi (1,651.27 km) |
| Helensburgh to Oggiono | 932.65 mi (1,500.96 km) |
| Helensburgh to Olbia | 1,224.96 mi (1,971.38 km) |
| Helensburgh to Oleggio | 923.30 mi (1,485.90 km) |
| Helensburgh to Olgiate Comasco | 921.97 mi (1,483.77 km) |
| Helensburgh to Olgiate Olona | 928.19 mi (1,493.79 km) |
| Helensburgh to Omegna | 901.27 mi (1,450.45 km) |
| Helensburgh to Opera | 951.57 mi (1,531.41 km) |
| Helensburgh to Oppeano | 1,012.26 mi (1,629.08 km) |
| Helensburgh to Orbassano | 929.38 mi (1,495.70 km) |
