| Porthcawl to Orangevale (California) | 5,159.28 mi (8,303.06 km) |
| Porthcawl to Orchards (Washington) | 4,802.91 mi (7,729.53 km) |
| Porthcawl to Orcutt (California) | 5,350.64 mi (8,611.02 km) |
| Porthcawl to Oregon (Ohio) | 3,656.80 mi (5,885.05 km) |
| Porthcawl to Oregon (Wisconsin) | 3,831.62 mi (6,166.40 km) |
| Porthcawl to Oregon City (Oregon) | 4,824.16 mi (7,763.74 km) |
| Porthcawl to Orem (Utah) | 4,764.05 mi (7,666.99 km) |
| Porthcawl to Orinda (California) | 5,234.71 mi (8,424.45 km) |
| Porthcawl to Orland Park (Illinois) | 3,832.73 mi (6,168.18 km) |
| Porthcawl to Orlando (Florida) | 4,190.40 mi (6,743.80 km) |
| Porthcawl to Ormond Beach (Florida) | 4,139.91 mi (6,662.54 km) |
| Porthcawl to Oro Valley (Arizona) | 5,163.84 mi (8,310.39 km) |
| Porthcawl to Oroville (California) | 5,123.80 mi (8,245.96 km) |
| Porthcawl to Oshkosh (Wisconsin) | 3,750.77 mi (6,036.29 km) |
| Porthcawl to Oskaloosa (Iowa) | 4,030.93 mi (6,487.16 km) |
