| Chambersburg to Orbetello | 4,395.73 mi (7,074.24 km) |
| Chambersburg to Oria | 4,747.29 mi (7,640.03 km) |
| Chambersburg to Oristano | 4,369.35 mi (7,031.80 km) |
| Chambersburg to Orta Nova | 4,632.06 mi (7,454.58 km) |
| Chambersburg to Orte | 4,446.02 mi (7,155.18 km) |
| Chambersburg to Ortona | 4,537.00 mi (7,301.59 km) |
| Chambersburg to Orvieto | 4,424.73 mi (7,120.92 km) |
| Chambersburg to Orzinuovi | 4,237.87 mi (6,820.20 km) |
| Chambersburg to Osimo | 4,455.95 mi (7,171.16 km) |
| Chambersburg to Ospitaletto | 4,238.56 mi (6,821.31 km) |
| Chambersburg to Ostuni | 4,735.91 mi (7,621.72 km) |
| Chambersburg to Ottaviano | 4,596.87 mi (7,397.96 km) |
| Chambersburg to Ovada | 4,208.41 mi (6,772.79 km) |
| Chambersburg to Ozieri | 4,363.83 mi (7,022.90 km) |
| Chambersburg to Paceco | 4,620.09 mi (7,435.32 km) |
