| Leiden to Oswego (Illinois) | 4,133.79 mi (6,652.69 km) |
| Leiden to Oswego (New York) | 3,606.87 mi (5,804.69 km) |
| Leiden to Otsego (Minnesota) | 4,145.16 mi (6,670.99 km) |
| Leiden to Ottawa (Illinois) | 4,167.69 mi (6,707.25 km) |
| Leiden to Ottawa (Kansas) | 4,539.63 mi (7,305.83 km) |
| Leiden to Ottumwa (Iowa) | 4,314.37 mi (6,943.30 km) |
| Leiden to Overland (Missouri) | 4,356.48 mi (7,011.07 km) |
| Leiden to Overland Park (Kansas) | 4,504.13 mi (7,248.70 km) |
| Leiden to Overlea (Maryland) | 3,793.17 mi (6,104.52 km) |
| Leiden to Oviedo (Florida) | 4,505.49 mi (7,250.89 km) |
| Leiden to Owasso (Oklahoma) | 4,680.42 mi (7,532.42 km) |
| Leiden to Owatonna (Minnesota) | 4,189.81 mi (6,742.85 km) |
| Leiden to Owensboro (Kentucky) | 4,281.58 mi (6,890.54 km) |
| Leiden to Owings Mills (Maryland) | 3,801.80 mi (6,118.41 km) |
| Leiden to Owosso (Michigan) | 3,917.73 mi (6,304.98 km) |
