| Alpena to Orbetello | 4,434.59 mi (7,136.78 km) |
| Alpena to Oria | 4,774.58 mi (7,683.95 km) |
| Alpena to Oristano | 4,436.77 mi (7,140.30 km) |
| Alpena to Orta Nova | 4,661.42 mi (7,501.82 km) |
| Alpena to Orte | 4,480.30 mi (7,210.34 km) |
| Alpena to Ortona | 4,564.35 mi (7,345.61 km) |
| Alpena to Orvieto | 4,458.18 mi (7,174.74 km) |
| Alpena to Orzinuovi | 4,259.18 mi (6,854.49 km) |
| Alpena to Osimo | 4,478.68 mi (7,207.73 km) |
| Alpena to Ospitaletto | 4,258.19 mi (6,852.90 km) |
| Alpena to Ostuni | 4,761.84 mi (7,663.43 km) |
| Alpena to Ottaviano | 4,634.47 mi (7,458.45 km) |
| Alpena to Ovada | 4,240.09 mi (6,823.77 km) |
| Alpena to Ozieri | 4,424.69 mi (7,120.85 km) |
| Alpena to Paceco | 4,685.34 mi (7,540.33 km) |
