| Arecibo to Orbetello | 4,761.85 mi (7,663.45 km) |
| Arecibo to Oria | 5,110.32 mi (8,224.26 km) |
| Arecibo to Oristano | 4,643.99 mi (7,473.79 km) |
| Arecibo to Orta Nova | 5,001.46 mi (8,049.08 km) |
| Arecibo to Orte | 4,821.13 mi (7,758.85 km) |
| Arecibo to Ortona | 4,923.98 mi (7,924.38 km) |
| Arecibo to Orvieto | 4,805.10 mi (7,733.06 km) |
| Arecibo to Orzinuovi | 4,680.11 mi (7,531.90 km) |
| Arecibo to Osimo | 4,867.48 mi (7,833.45 km) |
| Arecibo to Ospitaletto | 4,686.10 mi (7,541.54 km) |
| Arecibo to Ostuni | 5,104.73 mi (8,215.27 km) |
| Arecibo to Ottaviano | 4,943.25 mi (7,955.40 km) |
| Arecibo to Ovada | 4,620.91 mi (7,436.64 km) |
| Arecibo to Ozieri | 4,661.11 mi (7,501.33 km) |
| Arecibo to Paceco | 4,871.42 mi (7,839.79 km) |
