| Opfikon to Oswego (Illinois) | 4,462.92 mi (7,182.38 km) |
| Opfikon to Oswego (New York) | 3,918.93 mi (6,306.90 km) |
| Opfikon to Otsego (Minnesota) | 4,490.77 mi (7,227.19 km) |
| Opfikon to Ottawa (Illinois) | 4,496.88 mi (7,237.03 km) |
| Opfikon to Ottawa (Kansas) | 4,874.04 mi (7,844.00 km) |
| Opfikon to Ottumwa (Iowa) | 4,649.08 mi (7,481.97 km) |
| Opfikon to Overland (Missouri) | 4,681.93 mi (7,534.83 km) |
| Opfikon to Overland Park (Kansas) | 4,838.12 mi (7,786.20 km) |
| Opfikon to Overlea (Maryland) | 4,090.83 mi (6,583.56 km) |
| Opfikon to Oviedo (Florida) | 4,778.51 mi (7,690.27 km) |
| Opfikon to Owasso (Oklahoma) | 5,010.92 mi (8,064.30 km) |
| Opfikon to Owatonna (Minnesota) | 4,532.47 mi (7,294.31 km) |
| Opfikon to Owensboro (Kentucky) | 4,597.93 mi (7,399.66 km) |
| Opfikon to Owings Mills (Maryland) | 4,100.27 mi (6,598.75 km) |
| Opfikon to Owosso (Michigan) | 4,242.89 mi (6,828.27 km) |
