| Llantrisant to Orangevale (California) | 5,166.00 mi (8,313.87 km) |
| Llantrisant to Orchards (Washington) | 4,808.49 mi (7,738.52 km) |
| Llantrisant to Orcutt (California) | 5,357.95 mi (8,622.79 km) |
| Llantrisant to Oregon (Ohio) | 3,667.61 mi (5,902.45 km) |
| Llantrisant to Oregon (Wisconsin) | 3,841.64 mi (6,182.52 km) |
| Llantrisant to Oregon City (Oregon) | 4,829.79 mi (7,772.79 km) |
| Llantrisant to Orem (Utah) | 4,771.86 mi (7,679.57 km) |
| Llantrisant to Orinda (California) | 5,241.39 mi (8,435.20 km) |
| Llantrisant to Orland Park (Illinois) | 3,843.10 mi (6,184.88 km) |
| Llantrisant to Orlando (Florida) | 4,203.00 mi (6,764.07 km) |
| Llantrisant to Ormond Beach (Florida) | 4,152.45 mi (6,682.73 km) |
| Llantrisant to Oro Valley (Arizona) | 5,172.78 mi (8,324.78 km) |
| Llantrisant to Oroville (California) | 5,130.36 mi (8,256.52 km) |
| Llantrisant to Oshkosh (Wisconsin) | 3,760.69 mi (6,052.25 km) |
| Llantrisant to Oskaloosa (Iowa) | 4,040.86 mi (6,503.14 km) |
