| Dumont to Orbetello | 4,196.49 mi (6,753.60 km) |
| Dumont to Oria | 4,548.98 mi (7,320.88 km) |
| Dumont to Oristano | 4,167.48 mi (6,706.92 km) |
| Dumont to Orta Nova | 4,433.63 mi (7,135.25 km) |
| Dumont to Orte | 4,247.23 mi (6,835.26 km) |
| Dumont to Ortona | 4,338.90 mi (6,982.78 km) |
| Dumont to Orvieto | 4,226.06 mi (6,801.18 km) |
| Dumont to Orzinuovi | 4,040.84 mi (6,503.10 km) |
| Dumont to Osimo | 4,258.49 mi (6,853.37 km) |
| Dumont to Ospitaletto | 4,041.74 mi (6,504.55 km) |
| Dumont to Ostuni | 4,537.78 mi (7,302.84 km) |
| Dumont to Ottaviano | 4,397.58 mi (7,077.22 km) |
| Dumont to Ovada | 4,010.17 mi (6,453.75 km) |
| Dumont to Ozieri | 4,162.50 mi (6,698.90 km) |
| Dumont to Paceco | 4,418.22 mi (7,110.45 km) |
