| Alcala la Real to Oswego (Illinois) | 4,317.12 mi (6,947.73 km) |
| Alcala la Real to Oswego (New York) | 3,716.78 mi (5,981.59 km) |
| Alcala la Real to Otsego (Minnesota) | 4,437.45 mi (7,141.39 km) |
| Alcala la Real to Ottawa (Illinois) | 4,349.97 mi (7,000.60 km) |
| Alcala la Real to Ottawa (Kansas) | 4,740.24 mi (7,628.67 km) |
| Alcala la Real to Ottumwa (Iowa) | 4,525.39 mi (7,282.91 km) |
| Alcala la Real to Overland (Missouri) | 4,509.02 mi (7,256.56 km) |
| Alcala la Real to Overland Park (Kansas) | 4,703.37 mi (7,569.34 km) |
| Alcala la Real to Overlea (Maryland) | 3,821.23 mi (6,149.68 km) |
| Alcala la Real to Oviedo (Florida) | 4,392.19 mi (7,068.55 km) |
| Alcala la Real to Owasso (Oklahoma) | 4,851.34 mi (7,807.47 km) |
| Alcala la Real to Owatonna (Minnesota) | 4,459.12 mi (7,176.26 km) |
| Alcala la Real to Owensboro (Kentucky) | 4,385.45 mi (7,057.70 km) |
| Alcala la Real to Owings Mills (Maryland) | 3,833.43 mi (6,169.31 km) |
| Alcala la Real to Owosso (Michigan) | 4,086.34 mi (6,576.33 km) |
