| Oklahoma City to Oerlinghausen | 4,940.61 mi (7,951.15 km) |
| Oklahoma City to Oestrich-Winkel | 4,993.64 mi (8,036.48 km) |
| Oklahoma City to Offenburg | 5,051.47 mi (8,129.56 km) |
| Oklahoma City to Oftersheim | 5,039.91 mi (8,110.96 km) |
| Oklahoma City to Ohrdruf | 5,058.75 mi (8,141.27 km) |
| Oklahoma City to Ohringen | 5,080.37 mi (8,176.07 km) |
| Oklahoma City to Olbernhau | 5,156.26 mi (8,298.20 km) |
| Oklahoma City to Olching | 5,188.05 mi (8,349.36 km) |
| Oklahoma City to Oldenburg | 4,879.25 mi (7,852.39 km) |
| Oklahoma City to Oldenburg in Holstein | 4,923.84 mi (7,924.16 km) |
| Oklahoma City to Olfen | 4,904.88 mi (7,893.65 km) |
| Oklahoma City to Olpe | 4,947.97 mi (7,962.98 km) |
| Oklahoma City to Olsberg | 4,958.24 mi (7,979.51 km) |
| Oklahoma City to Oranienburg | 5,064.97 mi (8,151.28 km) |
| Oklahoma City to Ortenberg | 5,017.93 mi (8,075.58 km) |
