| Helena to Octeville | 4,595.69 mi (7,396.04 km) |
| Helena to Oignies | 4,694.82 mi (7,555.58 km) |
| Helena to Oissel | 4,694.85 mi (7,555.63 km) |
| Helena to Olivet | 4,795.07 mi (7,716.92 km) |
| Helena to Ollioules | 5,167.22 mi (8,315.84 km) |
| Helena to Olonne-sur-Mer | 4,744.62 mi (7,635.74 km) |
| Helena to Oloron-Sainte-Marie | 4,952.29 mi (7,969.95 km) |
| Helena to Onet Village | 4,997.99 mi (8,043.48 km) |
| Helena to Onnaing | 4,716.81 mi (7,590.97 km) |
| Helena to Orange | 5,080.97 mi (8,177.03 km) |
| Helena to Orchies | 4,701.93 mi (7,567.02 km) |
| Helena to Orleans | 4,793.36 mi (7,714.16 km) |
| Helena to Orly | 4,765.14 mi (7,668.76 km) |
| Helena to Ormesson-sur-Marne | 4,767.43 mi (7,672.44 km) |
| Helena to Orsay | 4,761.21 mi (7,662.43 km) |
