| Rhondda to Orbetello | 933.20 mi (1,501.83 km) |
| Rhondda to Oria | 1,260.58 mi (2,028.71 km) |
| Rhondda to Oristano | 992.08 mi (1,596.60 km) |
| Rhondda to Orta Nova | 1,148.84 mi (1,848.87 km) |
| Rhondda to Orte | 973.04 mi (1,565.95 km) |
| Rhondda to Ortona | 1,051.35 mi (1,691.99 km) |
| Rhondda to Orvieto | 950.48 mi (1,529.64 km) |
| Rhondda to Orzinuovi | 745.13 mi (1,199.17 km) |
| Rhondda to Osimo | 964.21 mi (1,551.75 km) |
| Rhondda to Ospitaletto | 743.53 mi (1,196.59 km) |
| Rhondda to Ostuni | 1,247.44 mi (2,007.56 km) |
| Rhondda to Ottaviano | 1,128.05 mi (1,815.42 km) |
| Rhondda to Ovada | 734.48 mi (1,182.03 km) |
| Rhondda to Ozieri | 964.18 mi (1,551.70 km) |
| Rhondda to Paceco | 1,219.26 mi (1,962.21 km) |
