| Porthcawl to Orbetello | 937.02 mi (1,507.99 km) |
| Porthcawl to Oria | 1,266.31 mi (2,037.93 km) |
| Porthcawl to Oristano | 992.57 mi (1,597.39 km) |
| Porthcawl to Orta Nova | 1,154.22 mi (1,857.54 km) |
| Porthcawl to Orte | 977.54 mi (1,573.19 km) |
| Porthcawl to Ortona | 1,056.79 mi (1,700.74 km) |
| Porthcawl to Orvieto | 955.01 mi (1,536.95 km) |
| Porthcawl to Orzinuovi | 750.74 mi (1,208.21 km) |
| Porthcawl to Osimo | 970.02 mi (1,561.10 km) |
| Porthcawl to Ospitaletto | 749.38 mi (1,206.01 km) |
| Porthcawl to Ostuni | 1,253.28 mi (2,016.95 km) |
| Porthcawl to Ottaviano | 1,132.56 mi (1,822.68 km) |
| Porthcawl to Ovada | 738.53 mi (1,188.55 km) |
| Porthcawl to Ozieri | 965.34 mi (1,553.57 km) |
| Porthcawl to Paceco | 1,221.19 mi (1,965.31 km) |
