| Alba Iulia to Oerlinghausen | 786.62 mi (1,265.94 km) |
| Alba Iulia to Oestrich-Winkel | 767.22 mi (1,234.72 km) |
| Alba Iulia to Offenburg | 750.22 mi (1,207.36 km) |
| Alba Iulia to Oftersheim | 731.56 mi (1,177.34 km) |
| Alba Iulia to Ohrdruf | 672.74 mi (1,082.67 km) |
| Alba Iulia to Ohringen | 688.73 mi (1,108.40 km) |
| Alba Iulia to Olbernhau | 566.49 mi (911.67 km) |
| Alba Iulia to Olching | 593.79 mi (955.62 km) |
| Alba Iulia to Oldenburg | 840.91 mi (1,353.31 km) |
| Alba Iulia to Oldenburg in Holstein | 796.87 mi (1,282.44 km) |
| Alba Iulia to Olfen | 829.99 mi (1,335.73 km) |
| Alba Iulia to Olpe | 794.85 mi (1,279.19 km) |
| Alba Iulia to Olsberg | 776.67 mi (1,249.93 km) |
| Alba Iulia to Oranienburg | 653.98 mi (1,052.48 km) |
| Alba Iulia to Ortenberg | 729.46 mi (1,173.95 km) |
