| Pontypridd to Nuth | 401.41 mi (646.01 km) |
| Pontypridd to Oegstgeest | 335.21 mi (539.47 km) |
| Pontypridd to Oirschot | 371.14 mi (597.29 km) |
| Pontypridd to Oisterwijk | 366.45 mi (589.75 km) |
| Pontypridd to Oldebroek | 396.97 mi (638.86 km) |
| Pontypridd to Oldenzaal | 439.89 mi (707.93 km) |
| Pontypridd to Ommen | 419.02 mi (674.35 km) |
| Pontypridd to Oosterend | 408.80 mi (657.90 km) |
| Pontypridd to Oosterhout | 351.53 mi (565.73 km) |
| Pontypridd to Oosterwolde | 417.87 mi (672.49 km) |
| Pontypridd to Oostzaan | 354.23 mi (570.08 km) |
| Pontypridd to Opmeer | 359.41 mi (578.41 km) |
| Pontypridd to Oss | 379.42 mi (610.62 km) |
| Pontypridd to Oud-Beijerland | 331.64 mi (533.72 km) |
| Pontypridd to Oudenbosch | 337.45 mi (543.08 km) |
