| Llanelli to Oswego (Illinois) | 3,823.30 mi (6,153.01 km) |
| Llanelli to Oswego (New York) | 3,278.84 mi (5,276.78 km) |
| Llanelli to Otsego (Minnesota) | 3,858.19 mi (6,209.15 km) |
| Llanelli to Ottawa (Illinois) | 3,857.26 mi (6,207.66 km) |
| Llanelli to Ottawa (Kansas) | 4,235.59 mi (6,816.52 km) |
| Llanelli to Ottumwa (Iowa) | 4,010.83 mi (6,454.80 km) |
| Llanelli to Overland (Missouri) | 4,041.72 mi (6,504.51 km) |
| Llanelli to Overland Park (Kansas) | 4,199.56 mi (6,758.53 km) |
| Llanelli to Overlea (Maryland) | 3,453.91 mi (5,558.54 km) |
| Llanelli to Oviedo (Florida) | 4,152.72 mi (6,683.16 km) |
| Llanelli to Owasso (Oklahoma) | 4,371.42 mi (7,035.11 km) |
| Llanelli to Owatonna (Minnesota) | 3,897.91 mi (6,273.08 km) |
| Llanelli to Owensboro (Kentucky) | 3,957.56 mi (6,369.08 km) |
| Llanelli to Owings Mills (Maryland) | 3,463.11 mi (5,573.33 km) |
| Llanelli to Owosso (Michigan) | 3,602.72 mi (5,798.01 km) |
