| Halifax to Oberkirch | 560.07 mi (901.34 km) |
| Halifax to Obernburg am Main | 540.73 mi (870.23 km) |
| Halifax to Obernkirchen | 467.12 mi (751.76 km) |
| Halifax to Oberschleissheim | 694.18 mi (1,117.18 km) |
| Halifax to Oberstdorf | 687.13 mi (1,105.84 km) |
| Halifax to Obertraubling | 687.34 mi (1,106.16 km) |
| Halifax to Obertshausen | 520.66 mi (837.92 km) |
| Halifax to Oberursel | 506.00 mi (814.33 km) |
| Halifax to Ochsenfurt | 582.39 mi (937.26 km) |
| Halifax to Ochsenhausen | 644.74 mi (1,037.62 km) |
| Halifax to Ochtrup | 390.80 mi (628.93 km) |
| Halifax to Odenthal | 421.53 mi (678.38 km) |
| Halifax to Oelde | 437.98 mi (704.86 km) |
| Halifax to Oelsnitz | 636.87 mi (1,024.94 km) |
| Halifax to Oer-Erkenschwick | 407.60 mi (655.97 km) |
