| Aberystwyth to Orbetello | 989.18 mi (1,591.94 km) |
| Aberystwyth to Oria | 1,312.43 mi (2,112.15 km) |
| Aberystwyth to Oristano | 1,052.47 mi (1,693.79 km) |
| Aberystwyth to Orta Nova | 1,201.54 mi (1,933.69 km) |
| Aberystwyth to Orte | 1,027.73 mi (1,653.97 km) |
| Aberystwyth to Ortona | 1,104.00 mi (1,776.71 km) |
| Aberystwyth to Orvieto | 1,005.11 mi (1,617.56 km) |
| Aberystwyth to Orzinuovi | 797.66 mi (1,283.72 km) |
| Aberystwyth to Osimo | 1,016.04 mi (1,635.16 km) |
| Aberystwyth to Ospitaletto | 795.52 mi (1,280.26 km) |
| Aberystwyth to Ostuni | 1,299.03 mi (2,090.59 km) |
| Aberystwyth to Ottaviano | 1,182.62 mi (1,903.25 km) |
| Aberystwyth to Ovada | 790.22 mi (1,271.73 km) |
| Aberystwyth to Ozieri | 1,023.92 mi (1,647.83 km) |
| Aberystwyth to Paceco | 1,278.04 mi (2,056.81 km) |
