| Kalkara to Oberkirch | 932.98 mi (1,501.49 km) |
| Kalkara to Obernburg am Main | 1,001.11 mi (1,611.13 km) |
| Kalkara to Obernkirchen | 1,162.18 mi (1,870.35 km) |
| Kalkara to Oberschleissheim | 867.28 mi (1,395.76 km) |
| Kalkara to Oberstdorf | 825.34 mi (1,328.26 km) |
| Kalkara to Obertraubling | 911.38 mi (1,466.73 km) |
| Kalkara to Obertshausen | 1,020.25 mi (1,641.93 km) |
| Kalkara to Oberursel | 1,032.83 mi (1,662.17 km) |
| Kalkara to Ochsenfurt | 976.89 mi (1,572.16 km) |
| Kalkara to Ochsenhausen | 873.62 mi (1,405.95 km) |
| Kalkara to Ochtrup | 1,183.32 mi (1,904.37 km) |
| Kalkara to Odenthal | 1,109.05 mi (1,784.84 km) |
| Kalkara to Oelde | 1,145.46 mi (1,843.43 km) |
| Kalkara to Oelsnitz | 1,010.66 mi (1,626.49 km) |
| Kalkara to Oer-Erkenschwick | 1,146.02 mi (1,844.34 km) |
