| Llantwit Major to Orangevale (California) | 5,169.47 mi (8,319.46 km) |
| Llantwit Major to Orchards (Washington) | 4,812.81 mi (7,745.47 km) |
| Llantwit Major to Orcutt (California) | 5,360.95 mi (8,627.62 km) |
| Llantwit Major to Oregon (Ohio) | 3,667.32 mi (5,901.97 km) |
| Llantwit Major to Oregon (Wisconsin) | 3,842.19 mi (6,183.41 km) |
| Llantwit Major to Oregon City (Oregon) | 4,834.08 mi (7,779.69 km) |
| Llantwit Major to Orem (Utah) | 4,774.45 mi (7,683.73 km) |
| Llantwit Major to Orinda (California) | 5,244.89 mi (8,440.84 km) |
| Llantwit Major to Orland Park (Illinois) | 3,843.28 mi (6,185.16 km) |
| Llantwit Major to Orlando (Florida) | 4,200.40 mi (6,759.90 km) |
| Llantwit Major to Ormond Beach (Florida) | 4,149.94 mi (6,678.69 km) |
| Llantwit Major to Oro Valley (Arizona) | 5,174.37 mi (8,327.35 km) |
| Llantwit Major to Oroville (California) | 5,133.96 mi (8,262.31 km) |
| Llantwit Major to Oshkosh (Wisconsin) | 3,761.34 mi (6,053.30 km) |
| Llantwit Major to Oskaloosa (Iowa) | 4,041.50 mi (6,504.17 km) |
