| Shannon to Oria | 1,501.17 mi (2,415.91 km) |
| Shannon to Oristano | 1,209.26 mi (1,946.11 km) |
| Shannon to Orta Nova | 1,388.62 mi (2,234.77 km) |
| Shannon to Orte | 1,210.28 mi (1,947.76 km) |
| Shannon to Ortona | 1,291.31 mi (2,078.15 km) |
| Shannon to Orvieto | 1,187.87 mi (1,911.69 km) |
| Shannon to Orzinuovi | 985.62 mi (1,586.21 km) |
| Shannon to Osimo | 1,205.06 mi (1,939.36 km) |
| Shannon to Ospitaletto | 984.52 mi (1,584.43 km) |
| Shannon to Ostuni | 1,488.28 mi (2,395.16 km) |
| Shannon to Ottaviano | 1,365.22 mi (2,197.11 km) |
| Shannon to Ovada | 970.47 mi (1,561.83 km) |
| Shannon to Ozieri | 1,185.74 mi (1,908.27 km) |
| Shannon to Paceco | 1,444.58 mi (2,324.83 km) |
| Shannon to Pachino | 1,600.29 mi (2,575.42 km) |
