| Rhondda to Nasaud | 1,276.75 mi (2,054.73 km) |
| Rhondda to Navodari | 1,550.48 mi (2,495.26 km) |
| Rhondda to Negresti-Oas | 1,218.74 mi (1,961.37 km) |
| Rhondda to Nehoiu | 1,416.95 mi (2,280.36 km) |
| Rhondda to Ocna Mures | 1,279.56 mi (2,059.25 km) |
| Rhondda to Odobesti | 1,436.10 mi (2,311.18 km) |
| Rhondda to Odorheiu Secuiesc | 1,343.50 mi (2,162.16 km) |
| Rhondda to Oltenita | 1,474.71 mi (2,373.32 km) |
| Rhondda to Onesti | 1,408.01 mi (2,265.98 km) |
| Rhondda to Oradea | 1,176.39 mi (1,893.21 km) |
| Rhondda to Orastie | 1,268.47 mi (2,041.40 km) |
| Rhondda to Oravita | 1,231.79 mi (1,982.37 km) |
| Rhondda to Orsova | 1,272.83 mi (2,048.41 km) |
| Rhondda to Otelu Rosu | 1,243.47 mi (2,001.18 km) |
| Rhondda to Otopeni | 1,434.24 mi (2,308.19 km) |
