| Helena to Nasaud | 5,437.08 mi (8,750.14 km) |
| Helena to Navodari | 5,712.06 mi (9,192.66 km) |
| Helena to Negresti-Oas | 5,379.39 mi (8,657.29 km) |
| Helena to Nehoiu | 5,597.42 mi (9,008.17 km) |
| Helena to Ocna Mures | 5,478.53 mi (8,816.84 km) |
| Helena to Odobesti | 5,588.95 mi (8,994.54 km) |
| Helena to Odorheiu Secuiesc | 5,516.15 mi (8,877.38 km) |
| Helena to Oltenita | 5,682.59 mi (9,145.24 km) |
| Helena to Onesti | 5,552.20 mi (8,935.40 km) |
| Helena to Oradea | 5,392.04 mi (8,677.65 km) |
| Helena to Orastie | 5,495.59 mi (8,844.30 km) |
| Helena to Oravita | 5,507.48 mi (8,863.44 km) |
| Helena to Orsova | 5,543.76 mi (8,921.82 km) |
| Helena to Otelu Rosu | 5,495.20 mi (8,843.67 km) |
| Helena to Otopeni | 5,641.27 mi (9,078.75 km) |
