| Opfikon to Odessa (Texas) | 5,486.01 mi (8,828.88 km) |
| Opfikon to Ogden (Utah) | 5,312.22 mi (8,549.20 km) |
| Opfikon to Oildale (California) | 5,859.02 mi (9,429.18 km) |
| Opfikon to Ojus (Florida) | 4,862.45 mi (7,825.36 km) |
| Opfikon to Okemos (Michigan) | 4,264.95 mi (6,863.77 km) |
| Opfikon to Oklahoma City (Oklahoma) | 5,116.58 mi (8,234.34 km) |
| Opfikon to Okmulgee (Oklahoma) | 5,051.58 mi (8,129.73 km) |
| Opfikon to Olathe (Kansas) | 4,843.31 mi (7,794.56 km) |
| Opfikon to Old Jamestown (Missouri) | 4,671.83 mi (7,518.58 km) |
| Opfikon to Oldsmar (Florida) | 4,872.56 mi (7,841.63 km) |
| Opfikon to Olean (New York) | 4,054.12 mi (6,524.48 km) |
| Opfikon to Olive Branch (Mississippi) | 4,841.22 mi (7,791.19 km) |
| Opfikon to Olivehurst (California) | 5,718.73 mi (9,203.40 km) |
| Opfikon to Olney (Maryland) | 4,123.40 mi (6,635.96 km) |
| Opfikon to Olympia (Washington) | 5,284.30 mi (8,504.26 km) |
