| Otopeni to Oberkirch | 895.54 mi (1,441.23 km) |
| Otopeni to Obernburg am Main | 872.23 mi (1,403.71 km) |
| Otopeni to Obernkirchen | 939.11 mi (1,511.35 km) |
| Otopeni to Oberschleissheim | 735.43 mi (1,183.56 km) |
| Otopeni to Oberstdorf | 781.97 mi (1,258.46 km) |
| Otopeni to Obertraubling | 723.95 mi (1,165.09 km) |
| Otopeni to Obertshausen | 890.19 mi (1,432.62 km) |
| Otopeni to Oberursel | 903.98 mi (1,454.81 km) |
| Otopeni to Ochsenfurt | 828.89 mi (1,333.96 km) |
| Otopeni to Ochsenhausen | 805.23 mi (1,295.90 km) |
| Otopeni to Ochtrup | 1,010.62 mi (1,626.43 km) |
| Otopeni to Odenthal | 983.35 mi (1,582.55 km) |
| Otopeni to Oelde | 962.85 mi (1,549.56 km) |
| Otopeni to Oelsnitz | 763.51 mi (1,228.76 km) |
| Otopeni to Oer-Erkenschwick | 992.97 mi (1,598.03 km) |
