| Porthcawl to Oerlinghausen | 529.30 mi (851.83 km) |
| Porthcawl to Oestrich-Winkel | 520.68 mi (837.95 km) |
| Porthcawl to Offenburg | 556.11 mi (894.98 km) |
| Porthcawl to Oftersheim | 558.87 mi (899.41 km) |
| Porthcawl to Ohrdruf | 625.65 mi (1,006.88 km) |
| Porthcawl to Ohringen | 601.67 mi (968.29 km) |
| Porthcawl to Olbernhau | 739.49 mi (1,190.09 km) |
| Porthcawl to Olching | 704.55 mi (1,133.86 km) |
| Porthcawl to Oldenburg | 515.15 mi (829.06 km) |
| Porthcawl to Oldenburg in Holstein | 636.64 mi (1,024.58 km) |
| Porthcawl to Olfen | 475.08 mi (764.56 km) |
| Porthcawl to Olpe | 498.88 mi (802.86 km) |
| Porthcawl to Olsberg | 524.04 mi (843.36 km) |
| Porthcawl to Oranienburg | 721.82 mi (1,161.66 km) |
| Porthcawl to Ortenberg | 559.84 mi (900.98 km) |
