| Omagh to Orbetello | 1,185.51 mi (1,907.89 km) |
| Omagh to Oria | 1,502.00 mi (2,417.23 km) |
| Omagh to Oristano | 1,252.42 mi (2,015.58 km) |
| Omagh to Orta Nova | 1,392.73 mi (2,241.38 km) |
| Omagh to Orte | 1,222.25 mi (1,967.03 km) |
| Omagh to Ortona | 1,295.27 mi (2,084.53 km) |
| Omagh to Orvieto | 1,199.58 mi (1,930.54 km) |
| Omagh to Orzinuovi | 989.56 mi (1,592.54 km) |
| Omagh to Osimo | 1,206.20 mi (1,941.19 km) |
| Omagh to Ospitaletto | 986.60 mi (1,587.78 km) |
| Omagh to Ostuni | 1,488.17 mi (2,394.98 km) |
| Omagh to Ottaviano | 1,376.77 mi (2,215.70 km) |
| Omagh to Ovada | 986.50 mi (1,587.62 km) |
| Omagh to Ozieri | 1,223.73 mi (1,969.41 km) |
| Omagh to Paceco | 1,477.23 mi (2,377.38 km) |
