| Omagh to Octeville | 418.05 mi (672.79 km) |
| Omagh to Oignies | 516.82 mi (831.73 km) |
| Omagh to Oissel | 508.06 mi (817.64 km) |
| Omagh to Olivet | 610.64 mi (982.73 km) |
| Omagh to Ollioules | 987.78 mi (1,589.68 km) |
| Omagh to Olonne-sur-Mer | 606.42 mi (975.94 km) |
| Omagh to Oloron-Sainte-Marie | 842.95 mi (1,356.60 km) |
| Omagh to Onet Village | 832.45 mi (1,339.70 km) |
| Omagh to Onnaing | 541.45 mi (871.38 km) |
| Omagh to Orange | 901.72 mi (1,451.18 km) |
| Omagh to Orchies | 525.38 mi (845.51 km) |
| Omagh to Orleans | 608.75 mi (979.68 km) |
| Omagh to Orly | 578.12 mi (930.39 km) |
| Omagh to Ormesson-sur-Marne | 580.44 mi (934.12 km) |
| Omagh to Orsay | 574.26 mi (924.18 km) |
