| Billings to Oberkirch | 4,886.62 mi (7,864.26 km) |
| Billings to Obernburg am Main | 4,850.11 mi (7,805.50 km) |
| Billings to Obernkirchen | 4,723.52 mi (7,601.78 km) |
| Billings to Oberschleissheim | 5,004.89 mi (8,054.58 km) |
| Billings to Oberstdorf | 5,011.65 mi (8,065.47 km) |
| Billings to Obertraubling | 4,983.84 mi (8,020.71 km) |
| Billings to Obertshausen | 4,829.31 mi (7,772.02 km) |
| Billings to Oberursel | 4,814.72 mi (7,748.54 km) |
| Billings to Ochsenfurt | 4,887.01 mi (7,864.89 km) |
| Billings to Ochsenhausen | 4,966.69 mi (7,993.11 km) |
| Billings to Ochtrup | 4,671.84 mi (7,518.60 km) |
| Billings to Odenthal | 4,729.28 mi (7,611.04 km) |
| Billings to Oelde | 4,718.36 mi (7,593.47 km) |
| Billings to Oelsnitz | 4,906.13 mi (7,895.66 km) |
| Billings to Oer-Erkenschwick | 4,702.20 mi (7,567.46 km) |
