| Rhondda to Opole | 924.55 mi (1,487.92 km) |
| Rhondda to Orzesze | 967.84 mi (1,557.58 km) |
| Rhondda to Osowa | 926.17 mi (1,490.53 km) |
| Rhondda to Ostroda | 985.95 mi (1,586.74 km) |
| Rhondda to Ostroleka | 1,054.00 mi (1,696.25 km) |
| Rhondda to Ostrow Mazowiecka | 1,069.49 mi (1,721.18 km) |
| Rhondda to Ostrow Wielkopolski | 907.43 mi (1,460.37 km) |
| Rhondda to Ostrowiec Swietokrzyski | 1,068.58 mi (1,719.72 km) |
| Rhondda to Ostrzeszow | 914.84 mi (1,472.29 km) |
| Rhondda to Oswiecim | 990.01 mi (1,593.27 km) |
| Rhondda to Otwock | 1,048.64 mi (1,687.62 km) |
| Rhondda to Ozarow Mazowiecki | 1,028.12 mi (1,654.59 km) |
| Rhondda to Ozimek | 936.42 mi (1,507.03 km) |
| Rhondda to Ozorkow | 966.50 mi (1,555.44 km) |
| Rhondda to Pabianice | 973.85 mi (1,567.26 km) |
