| Bucharest to Oerlinghausen | 953.24 mi (1,534.10 km) |
| Bucharest to Oestrich-Winkel | 929.54 mi (1,495.94 km) |
| Bucharest to Offenburg | 906.25 mi (1,458.47 km) |
| Bucharest to Oftersheim | 892.02 mi (1,435.57 km) |
| Bucharest to Ohrdruf | 838.69 mi (1,349.74 km) |
| Bucharest to Ohringen | 849.12 mi (1,366.53 km) |
| Bucharest to Olbernhau | 733.36 mi (1,180.23 km) |
| Bucharest to Olching | 750.67 mi (1,208.08 km) |
| Bucharest to Oldenburg | 1,008.05 mi (1,622.31 km) |
| Bucharest to Oldenburg in Holstein | 962.48 mi (1,548.96 km) |
| Bucharest to Olfen | 995.89 mi (1,602.72 km) |
| Bucharest to Olpe | 959.72 mi (1,544.52 km) |
| Bucharest to Olsberg | 942.44 mi (1,516.72 km) |
| Bucharest to Oranienburg | 820.11 mi (1,319.84 km) |
| Bucharest to Ortenberg | 893.44 mi (1,437.85 km) |
