| Cluj-Napoca to Oberkirch | 730.39 mi (1,175.44 km) |
| Cluj-Napoca to Obernburg am Main | 695.59 mi (1,119.44 km) |
| Cluj-Napoca to Obernkirchen | 750.00 mi (1,207.00 km) |
| Cluj-Napoca to Oberschleissheim | 569.50 mi (916.52 km) |
| Cluj-Napoca to Oberstdorf | 626.68 mi (1,008.54 km) |
| Cluj-Napoca to Obertraubling | 549.95 mi (885.06 km) |
| Cluj-Napoca to Obertshausen | 712.38 mi (1,146.46 km) |
| Cluj-Napoca to Oberursel | 725.59 mi (1,167.72 km) |
| Cluj-Napoca to Ochsenfurt | 652.42 mi (1,049.97 km) |
| Cluj-Napoca to Ochsenhausen | 642.93 mi (1,034.69 km) |
| Cluj-Napoca to Ochtrup | 823.66 mi (1,325.55 km) |
| Cluj-Napoca to Odenthal | 801.76 mi (1,290.30 km) |
| Cluj-Napoca to Oelde | 776.40 mi (1,249.49 km) |
| Cluj-Napoca to Oelsnitz | 578.67 mi (931.27 km) |
| Cluj-Napoca to Oer-Erkenschwick | 808.28 mi (1,300.81 km) |
