| Llantwit Major to Oswego (Illinois) | 3,858.26 mi (6,209.28 km) |
| Llantwit Major to Oswego (New York) | 3,313.24 mi (5,332.15 km) |
| Llantwit Major to Otsego (Minnesota) | 3,893.43 mi (6,265.87 km) |
| Llantwit Major to Ottawa (Illinois) | 3,892.22 mi (6,263.92 km) |
| Llantwit Major to Ottawa (Kansas) | 4,270.66 mi (6,872.96 km) |
| Llantwit Major to Ottumwa (Iowa) | 4,045.92 mi (6,511.27 km) |
| Llantwit Major to Overland (Missouri) | 4,076.56 mi (6,560.59 km) |
| Llantwit Major to Overland Park (Kansas) | 4,234.62 mi (6,814.97 km) |
| Llantwit Major to Overlea (Maryland) | 3,487.66 mi (5,612.84 km) |
| Llantwit Major to Oviedo (Florida) | 4,185.12 mi (6,735.30 km) |
| Llantwit Major to Owasso (Oklahoma) | 4,406.39 mi (7,091.40 km) |
| Llantwit Major to Owatonna (Minnesota) | 3,933.13 mi (6,329.76 km) |
| Llantwit Major to Owensboro (Kentucky) | 3,992.10 mi (6,424.66 km) |
| Llantwit Major to Owings Mills (Maryland) | 3,496.89 mi (5,627.70 km) |
| Llantwit Major to Owosso (Michigan) | 3,637.57 mi (5,854.11 km) |
