| Ystrad Mynach to Orbetello | 928.25 mi (1,493.87 km) |
| Ystrad Mynach to Oria | 1,254.85 mi (2,019.49 km) |
| Ystrad Mynach to Oristano | 988.60 mi (1,591.00 km) |
| Ystrad Mynach to Orta Nova | 1,143.24 mi (1,839.87 km) |
| Ystrad Mynach to Orte | 967.81 mi (1,557.53 km) |
| Ystrad Mynach to Ortona | 1,045.74 mi (1,682.96 km) |
| Ystrad Mynach to Orvieto | 945.23 mi (1,521.20 km) |
| Ystrad Mynach to Orzinuovi | 739.48 mi (1,190.07 km) |
| Ystrad Mynach to Osimo | 958.46 mi (1,542.49 km) |
| Ystrad Mynach to Ospitaletto | 737.78 mi (1,187.34 km) |
| Ystrad Mynach to Ostuni | 1,241.67 mi (1,998.28 km) |
| Ystrad Mynach to Ottaviano | 1,122.80 mi (1,806.98 km) |
| Ystrad Mynach to Ovada | 729.45 mi (1,173.94 km) |
| Ystrad Mynach to Ozieri | 960.39 mi (1,545.60 km) |
| Ystrad Mynach to Paceco | 1,215.11 mi (1,955.53 km) |
