| Giurgiu to Oberkirch | 910.60 mi (1,465.47 km) |
| Giurgiu to Obernburg am Main | 891.99 mi (1,435.52 km) |
| Giurgiu to Obernkirchen | 965.36 mi (1,553.60 km) |
| Giurgiu to Oberschleissheim | 751.59 mi (1,209.56 km) |
| Giurgiu to Oberstdorf | 794.17 mi (1,278.09 km) |
| Giurgiu to Obertraubling | 743.26 mi (1,196.16 km) |
| Giurgiu to Obertshausen | 910.41 mi (1,465.16 km) |
| Giurgiu to Oberursel | 924.42 mi (1,487.72 km) |
| Giurgiu to Ochsenfurt | 848.73 mi (1,365.90 km) |
| Giurgiu to Ochsenhausen | 819.69 mi (1,319.16 km) |
| Giurgiu to Ochtrup | 1,035.32 mi (1,666.19 km) |
| Giurgiu to Odenthal | 1,005.11 mi (1,617.57 km) |
| Giurgiu to Oelde | 987.33 mi (1,588.95 km) |
| Giurgiu to Oelsnitz | 787.62 mi (1,267.55 km) |
| Giurgiu to Oer-Erkenschwick | 1,016.36 mi (1,635.67 km) |
