| DeForest to Orbetello | 4,744.82 mi (7,636.05 km) |
| DeForest to Oria | 5,082.30 mi (8,179.18 km) |
| DeForest to Oristano | 4,750.98 mi (7,645.96 km) |
| DeForest to Orta Nova | 4,969.69 mi (7,997.95 km) |
| DeForest to Orte | 4,789.71 mi (7,708.29 km) |
| DeForest to Ortona | 4,872.43 mi (7,841.43 km) |
| DeForest to Orvieto | 4,767.49 mi (7,672.53 km) |
| DeForest to Orzinuovi | 4,566.73 mi (7,349.44 km) |
| DeForest to Osimo | 4,786.08 mi (7,702.45 km) |
| DeForest to Ospitaletto | 4,565.43 mi (7,347.36 km) |
| DeForest to Ostuni | 5,069.33 mi (8,158.30 km) |
| DeForest to Ottaviano | 4,944.19 mi (7,956.90 km) |
| DeForest to Ovada | 4,549.47 mi (7,321.67 km) |
| DeForest to Ozieri | 4,738.10 mi (7,625.24 km) |
| DeForest to Paceco | 4,999.01 mi (8,045.12 km) |
