| Porthcawl to Odessa (Texas) | 4,871.81 mi (7,840.41 km) |
| Porthcawl to Ogden (Utah) | 4,723.38 mi (7,601.54 km) |
| Porthcawl to Oildale (California) | 5,273.79 mi (8,487.34 km) |
| Porthcawl to Ojus (Florida) | 4,265.96 mi (6,865.40 km) |
| Porthcawl to Okemos (Michigan) | 3,649.03 mi (5,872.55 km) |
| Porthcawl to Oklahoma City (Oklahoma) | 4,501.83 mi (7,245.00 km) |
| Porthcawl to Okmulgee (Oklahoma) | 4,436.24 mi (7,139.44 km) |
| Porthcawl to Olathe (Kansas) | 4,229.32 mi (6,806.43 km) |
| Porthcawl to Old Jamestown (Missouri) | 4,055.95 mi (6,527.42 km) |
| Porthcawl to Oldsmar (Florida) | 4,268.02 mi (6,868.71 km) |
| Porthcawl to Olean (New York) | 3,438.07 mi (5,533.04 km) |
| Porthcawl to Olive Branch (Mississippi) | 4,224.98 mi (6,799.46 km) |
| Porthcawl to Olivehurst (California) | 5,147.42 mi (8,283.98 km) |
| Porthcawl to Olney (Maryland) | 3,509.77 mi (5,648.43 km) |
| Porthcawl to Olympia (Washington) | 4,737.14 mi (7,623.69 km) |
