| Halifax to Orbetello | 982.78 mi (1,581.62 km) |
| Halifax to Oria | 1,286.19 mi (2,069.93 km) |
| Halifax to Oristano | 1,072.59 mi (1,726.16 km) |
| Halifax to Orta Nova | 1,179.28 mi (1,897.87 km) |
| Halifax to Orte | 1,015.07 mi (1,633.60 km) |
| Halifax to Ortona | 1,082.29 mi (1,741.78 km) |
| Halifax to Orvieto | 992.42 mi (1,597.14 km) |
| Halifax to Orzinuovi | 779.25 mi (1,254.09 km) |
| Halifax to Osimo | 992.13 mi (1,596.68 km) |
| Halifax to Ospitaletto | 775.10 mi (1,247.40 km) |
| Halifax to Ostuni | 1,271.93 mi (2,046.98 km) |
| Halifax to Ottaviano | 1,168.13 mi (1,879.92 km) |
| Halifax to Ovada | 785.26 mi (1,263.76 km) |
| Halifax to Ozieri | 1,038.93 mi (1,671.99 km) |
| Halifax to Paceco | 1,284.53 mi (2,067.25 km) |
