| Ashburn to Orbetello | 4,423.20 mi (7,118.45 km) |
| Ashburn to Oria | 4,775.80 mi (7,685.91 km) |
| Ashburn to Oristano | 4,393.24 mi (7,070.24 km) |
| Ashburn to Orta Nova | 4,660.44 mi (7,500.25 km) |
| Ashburn to Orte | 4,474.00 mi (7,200.21 km) |
| Ashburn to Ortona | 4,565.73 mi (7,347.83 km) |
| Ashburn to Orvieto | 4,452.84 mi (7,166.16 km) |
| Ashburn to Orzinuovi | 4,267.68 mi (6,868.17 km) |
| Ashburn to Osimo | 4,485.34 mi (7,218.45 km) |
| Ashburn to Ospitaletto | 4,268.58 mi (6,869.61 km) |
| Ashburn to Ostuni | 4,764.60 mi (7,667.89 km) |
| Ashburn to Ottaviano | 4,624.27 mi (7,442.05 km) |
| Ashburn to Ovada | 4,237.00 mi (6,818.78 km) |
| Ashburn to Ozieri | 4,388.56 mi (7,062.71 km) |
| Ashburn to Paceco | 4,643.97 mi (7,473.75 km) |
