| Pontypridd to Oerlinghausen | 513.32 mi (826.10 km) |
| Pontypridd to Oestrich-Winkel | 506.94 mi (815.84 km) |
| Pontypridd to Offenburg | 544.54 mi (876.36 km) |
| Pontypridd to Oftersheim | 545.80 mi (878.38 km) |
| Pontypridd to Ohrdruf | 610.54 mi (982.58 km) |
| Pontypridd to Ohringen | 588.53 mi (947.15 km) |
| Pontypridd to Olbernhau | 724.26 mi (1,165.59 km) |
| Pontypridd to Olching | 691.97 mi (1,113.61 km) |
| Pontypridd to Oldenburg | 498.37 mi (802.05 km) |
| Pontypridd to Oldenburg in Holstein | 619.57 mi (997.11 km) |
| Pontypridd to Olfen | 459.35 mi (739.26 km) |
| Pontypridd to Olpe | 483.89 mi (778.75 km) |
| Pontypridd to Olsberg | 508.63 mi (818.57 km) |
| Pontypridd to Oranienburg | 705.33 mi (1,135.12 km) |
| Pontypridd to Ortenberg | 545.45 mi (877.81 km) |
