| Helensburgh to Nasaud | 1,373.49 mi (2,210.42 km) |
| Helensburgh to Navodari | 1,659.65 mi (2,670.95 km) |
| Helensburgh to Negresti-Oas | 1,312.61 mi (2,112.43 km) |
| Helensburgh to Nehoiu | 1,527.35 mi (2,458.04 km) |
| Helensburgh to Ocna Mures | 1,391.03 mi (2,238.65 km) |
| Helensburgh to Odobesti | 1,537.63 mi (2,474.57 km) |
| Helensburgh to Odorheiu Secuiesc | 1,447.94 mi (2,330.23 km) |
| Helensburgh to Oltenita | 1,597.15 mi (2,570.36 km) |
| Helensburgh to Onesti | 1,505.29 mi (2,422.53 km) |
| Helensburgh to Oradea | 1,289.91 mi (2,075.90 km) |
| Helensburgh to Orastie | 1,390.56 mi (2,237.90 km) |
| Helensburgh to Oravita | 1,372.97 mi (2,209.57 km) |
| Helensburgh to Orsova | 1,413.25 mi (2,274.40 km) |
| Helensburgh to Otelu Rosu | 1,374.74 mi (2,212.43 km) |
| Helensburgh to Otopeni | 1,554.92 mi (2,502.41 km) |
