| Enniskillen to Orbetello | 1,186.58 mi (1,909.61 km) |
| Enniskillen to Oria | 1,505.82 mi (2,423.38 km) |
| Enniskillen to Oristano | 1,249.60 mi (2,011.04 km) |
| Enniskillen to Orta Nova | 1,395.99 mi (2,246.63 km) |
| Enniskillen to Orte | 1,224.19 mi (1,970.14 km) |
| Enniskillen to Ortona | 1,298.47 mi (2,089.69 km) |
| Enniskillen to Orvieto | 1,201.53 mi (1,933.68 km) |
| Enniskillen to Orzinuovi | 992.44 mi (1,597.18 km) |
| Enniskillen to Osimo | 1,209.75 mi (1,946.91 km) |
| Enniskillen to Ospitaletto | 989.75 mi (1,592.85 km) |
| Enniskillen to Ostuni | 1,492.13 mi (2,401.35 km) |
| Enniskillen to Ottaviano | 1,378.90 mi (2,219.13 km) |
| Enniskillen to Ovada | 987.55 mi (1,589.31 km) |
| Enniskillen to Ozieri | 1,221.69 mi (1,966.12 km) |
| Enniskillen to Paceco | 1,476.21 mi (2,375.73 km) |
