| Castelldefels to Oberkirch | 583.04 mi (938.32 km) |
| Castelldefels to Obernburg am Main | 684.79 mi (1,102.06 km) |
| Castelldefels to Obernkirchen | 829.93 mi (1,335.65 km) |
| Castelldefels to Oberschleissheim | 672.24 mi (1,081.87 km) |
| Castelldefels to Oberstdorf | 588.98 mi (947.88 km) |
| Castelldefels to Obertraubling | 725.93 mi (1,168.28 km) |
| Castelldefels to Obertshausen | 690.79 mi (1,111.72 km) |
| Castelldefels to Oberursel | 693.18 mi (1,115.57 km) |
| Castelldefels to Ochsenfurt | 697.77 mi (1,122.95 km) |
| Castelldefels to Ochsenhausen | 610.57 mi (982.62 km) |
| Castelldefels to Ochtrup | 793.70 mi (1,277.33 km) |
| Castelldefels to Odenthal | 716.94 mi (1,153.80 km) |
| Castelldefels to Oelde | 785.24 mi (1,263.72 km) |
| Castelldefels to Oelsnitz | 797.85 mi (1,284.02 km) |
| Castelldefels to Oer-Erkenschwick | 758.18 mi (1,220.18 km) |
