| Porthcawl to Oberkirch | 560.27 mi (901.66 km) |
| Porthcawl to Obernburg am Main | 572.53 mi (921.40 km) |
| Porthcawl to Obernkirchen | 548.33 mi (882.45 km) |
| Porthcawl to Oberschleissheim | 713.63 mi (1,148.48 km) |
| Porthcawl to Oberstdorf | 686.24 mi (1,104.40 km) |
| Porthcawl to Obertraubling | 720.60 mi (1,159.69 km) |
| Porthcawl to Obertshausen | 555.12 mi (893.37 km) |
| Porthcawl to Oberursel | 541.76 mi (871.88 km) |
| Porthcawl to Ochsenfurt | 615.87 mi (991.15 km) |
| Porthcawl to Ochsenhausen | 651.26 mi (1,048.11 km) |
| Porthcawl to Ochtrup | 466.70 mi (751.08 km) |
| Porthcawl to Odenthal | 467.88 mi (752.98 km) |
| Porthcawl to Oelde | 507.53 mi (816.79 km) |
| Porthcawl to Oelsnitz | 692.77 mi (1,114.90 km) |
| Porthcawl to Oer-Erkenschwick | 469.64 mi (755.82 km) |
