| Milford Haven to Oberkirch | 620.53 mi (998.65 km) |
| Milford Haven to Obernburg am Main | 632.01 mi (1,017.13 km) |
| Milford Haven to Obernkirchen | 602.73 mi (970.00 km) |
| Milford Haven to Oberschleissheim | 773.78 mi (1,245.27 km) |
| Milford Haven to Oberstdorf | 746.45 mi (1,201.30 km) |
| Milford Haven to Obertraubling | 780.27 mi (1,255.73 km) |
| Milford Haven to Obertshausen | 614.41 mi (988.79 km) |
| Milford Haven to Oberursel | 600.93 mi (967.10 km) |
| Milford Haven to Ochsenfurt | 675.36 mi (1,086.89 km) |
| Milford Haven to Ochsenhausen | 711.53 mi (1,145.10 km) |
| Milford Haven to Ochtrup | 521.32 mi (838.98 km) |
| Milford Haven to Odenthal | 525.93 mi (846.41 km) |
| Milford Haven to Oelde | 563.31 mi (906.57 km) |
| Milford Haven to Oelsnitz | 750.82 mi (1,208.32 km) |
| Milford Haven to Oer-Erkenschwick | 526.09 mi (846.67 km) |
