| Ponca City to Orbetello | 5,348.54 mi (8,607.65 km) |
| Ponca City to Oria | 5,687.74 mi (9,153.53 km) |
| Ponca City to Oristano | 5,349.84 mi (8,609.74 km) |
| Ponca City to Orta Nova | 5,574.81 mi (8,971.79 km) |
| Ponca City to Orte | 5,394.07 mi (8,680.92 km) |
| Ponca City to Ortona | 5,477.66 mi (8,815.44 km) |
| Ponca City to Orvieto | 5,371.92 mi (8,645.27 km) |
| Ponca City to Orzinuovi | 5,172.22 mi (8,323.89 km) |
| Ponca City to Osimo | 5,391.66 mi (8,677.04 km) |
| Ponca City to Ospitaletto | 5,171.08 mi (8,322.05 km) |
| Ponca City to Ostuni | 5,674.88 mi (9,132.84 km) |
| Ponca City to Ottaviano | 5,548.32 mi (8,929.16 km) |
| Ponca City to Ovada | 5,153.85 mi (8,294.32 km) |
| Ponca City to Ozieri | 5,338.25 mi (8,591.08 km) |
| Ponca City to Paceco | 5,598.73 mi (9,010.29 km) |
