| Rhyl to Orbetello | 1,010.40 mi (1,626.08 km) |
| Rhyl to Oria | 1,324.18 mi (2,131.06 km) |
| Rhyl to Oristano | 1,086.37 mi (1,748.34 km) |
| Rhyl to Orta Nova | 1,215.19 mi (1,955.66 km) |
| Rhyl to Orte | 1,045.93 mi (1,683.27 km) |
| Rhyl to Ortona | 1,117.77 mi (1,798.88 km) |
| Rhyl to Orvieto | 1,023.25 mi (1,646.76 km) |
| Rhyl to Orzinuovi | 812.38 mi (1,307.39 km) |
| Rhyl to Osimo | 1,028.52 mi (1,655.25 km) |
| Rhyl to Ospitaletto | 809.20 mi (1,302.29 km) |
| Rhyl to Ostuni | 1,310.31 mi (2,108.75 km) |
| Rhyl to Ottaviano | 1,200.18 mi (1,931.51 km) |
| Rhyl to Ovada | 811.60 mi (1,306.15 km) |
| Rhyl to Ozieri | 1,055.42 mi (1,698.53 km) |
| Rhyl to Paceco | 1,305.96 mi (2,101.75 km) |
