| Rathfarnham to Oria | 1,422.57 mi (2,289.40 km) |
| Rathfarnham to Oristano | 1,159.16 mi (1,865.49 km) |
| Rathfarnham to Orta Nova | 1,311.84 mi (2,111.21 km) |
| Rathfarnham to Orte | 1,138.14 mi (1,831.66 km) |
| Rathfarnham to Ortona | 1,214.30 mi (1,954.22 km) |
| Rathfarnham to Orvieto | 1,115.52 mi (1,795.26 km) |
| Rathfarnham to Orzinuovi | 907.98 mi (1,461.26 km) |
| Rathfarnham to Osimo | 1,126.21 mi (1,812.46 km) |
| Rathfarnham to Ospitaletto | 905.75 mi (1,457.67 km) |
| Rathfarnham to Ostuni | 1,409.11 mi (2,267.74 km) |
| Rathfarnham to Ottaviano | 1,293.04 mi (2,080.95 km) |
| Rathfarnham to Ovada | 900.48 mi (1,449.19 km) |
| Rathfarnham to Ozieri | 1,131.67 mi (1,821.24 km) |
| Rathfarnham to Paceco | 1,386.85 mi (2,231.93 km) |
| Rathfarnham to Pachino | 1,538.51 mi (2,475.99 km) |
