| Otopeni to Oerlinghausen | 946.83 mi (1,523.77 km) |
| Otopeni to Oestrich-Winkel | 923.96 mi (1,486.97 km) |
| Otopeni to Offenburg | 901.41 mi (1,450.68 km) |
| Otopeni to Oftersheim | 886.68 mi (1,426.98 km) |
| Otopeni to Ohrdruf | 832.46 mi (1,339.72 km) |
| Otopeni to Ohringen | 843.78 mi (1,357.93 km) |
| Otopeni to Olbernhau | 726.84 mi (1,169.73 km) |
| Otopeni to Olching | 745.69 mi (1,200.08 km) |
| Otopeni to Oldenburg | 1,001.31 mi (1,611.45 km) |
| Otopeni to Oldenburg in Holstein | 955.16 mi (1,537.18 km) |
| Otopeni to Olfen | 989.68 mi (1,592.74 km) |
| Otopeni to Olpe | 953.74 mi (1,534.89 km) |
| Otopeni to Olsberg | 936.27 mi (1,506.78 km) |
| Otopeni to Oranienburg | 812.89 mi (1,308.22 km) |
| Otopeni to Ortenberg | 887.61 mi (1,428.47 km) |
