| Key West to Octeville | 4,512.74 mi (7,262.56 km) |
| Key West to Oignies | 4,703.54 mi (7,569.62 km) |
| Key West to Oissel | 4,637.01 mi (7,462.54 km) |
| Key West to Olivet | 4,694.69 mi (7,555.38 km) |
| Key West to Ollioules | 4,963.28 mi (7,987.63 km) |
| Key West to Olonne-sur-Mer | 4,544.62 mi (7,313.87 km) |
| Key West to Oloron-Sainte-Marie | 4,648.22 mi (7,480.58 km) |
| Key West to Onet Village | 4,784.02 mi (7,699.14 km) |
| Key West to Onnaing | 4,730.74 mi (7,613.38 km) |
| Key West to Orange | 4,893.95 mi (7,876.05 km) |
| Key West to Orchies | 4,714.22 mi (7,586.80 km) |
| Key West to Orleans | 4,694.48 mi (7,555.04 km) |
| Key West to Orly | 4,703.34 mi (7,569.29 km) |
| Key West to Ormesson-sur-Marne | 4,709.16 mi (7,578.66 km) |
| Key West to Orsay | 4,694.90 mi (7,555.71 km) |
