| Frechen to Obernburg am Main | 126.59 mi (203.72 km) |
| Frechen to Obernkirchen | 135.83 mi (218.60 km) |
| Frechen to Oberschleissheim | 281.37 mi (452.82 km) |
| Frechen to Oberstdorf | 288.35 mi (464.05 km) |
| Frechen to Obertraubling | 273.34 mi (439.90 km) |
| Frechen to Obertshausen | 106.33 mi (171.12 km) |
| Frechen to Oberursel | 91.64 mi (147.48 km) |
| Frechen to Ochsenfurt | 168.05 mi (270.45 km) |
| Frechen to Ochsenhausen | 241.56 mi (388.75 km) |
| Frechen to Ochtrup | 90.49 mi (145.63 km) |
| Frechen to Odenthal | 15.34 mi (24.68 km) |
| Frechen to Oelde | 85.54 mi (137.66 km) |
| Frechen to Oelsnitz | 236.77 mi (381.05 km) |
| Frechen to Oer-Erkenschwick | 53.52 mi (86.14 km) |
| Frechen to Oerlinghausen | 107.75 mi (173.40 km) |
