| Key Biscayne to Olivares | 4,323.89 mi (6,958.62 km) |
| Key Biscayne to Olivenza | 4,255.04 mi (6,847.82 km) |
| Key Biscayne to Olot | 4,690.35 mi (7,548.39 km) |
| Key Biscayne to Onate | 4,434.09 mi (7,135.98 km) |
| Key Biscayne to Onda | 4,591.25 mi (7,388.90 km) |
| Key Biscayne to Onteniente | 4,593.55 mi (7,392.61 km) |
| Key Biscayne to Orihuela | 4,588.91 mi (7,385.14 km) |
| Key Biscayne to Osuna | 4,382.95 mi (7,053.68 km) |
| Key Biscayne to Ourense | 4,170.84 mi (6,712.32 km) |
| Key Biscayne to Oviedo | 4,260.25 mi (6,856.22 km) |
| Key Biscayne to Paiporta | 4,592.65 mi (7,391.16 km) |
| Key Biscayne to Pajara | 4,018.23 mi (6,466.71 km) |
| Key Biscayne to Palafolls | 4,712.75 mi (7,584.44 km) |
| Key Biscayne to Palafrugell | 4,728.57 mi (7,609.90 km) |
| Key Biscayne to Palamos | 4,728.22 mi (7,609.34 km) |
