| Helena to Orbetello | 5,371.26 mi (8,644.21 km) |
| Helena to Oria | 5,668.68 mi (9,122.85 km) |
| Helena to Oristano | 5,430.63 mi (8,739.76 km) |
| Helena to Orta Nova | 5,566.02 mi (8,957.64 km) |
| Helena to Orte | 5,405.01 mi (8,698.52 km) |
| Helena to Ortona | 5,469.94 mi (8,803.01 km) |
| Helena to Orvieto | 5,382.35 mi (8,662.05 km) |
| Helena to Orzinuovi | 5,169.07 mi (8,318.82 km) |
| Helena to Osimo | 5,379.14 mi (8,656.89 km) |
| Helena to Ospitaletto | 5,164.61 mi (8,311.64 km) |
| Helena to Ostuni | 5,653.65 mi (9,098.67 km) |
| Helena to Ottaviano | 5,557.94 mi (8,944.65 km) |
| Helena to Ovada | 5,172.57 mi (8,324.45 km) |
| Helena to Ozieri | 5,406.26 mi (8,700.53 km) |
| Helena to Paceco | 5,663.05 mi (9,113.79 km) |
