| Opfikon to Oak Harbor (Washington) | 5,204.05 mi (8,375.11 km) |
| Opfikon to Oak Hills (Oregon) | 5,371.53 mi (8,644.63 km) |
| Opfikon to Oak Lawn (Illinois) | 4,439.06 mi (7,143.97 km) |
| Opfikon to Oak Park (California) | 5,923.39 mi (9,532.77 km) |
| Opfikon to Oak Park (Illinois) | 4,432.52 mi (7,133.45 km) |
| Opfikon to Oak Park (Michigan) | 4,227.39 mi (6,803.33 km) |
| Opfikon to Oak Ridge (Florida) | 4,797.43 mi (7,720.72 km) |
| Opfikon to Oak Ridge (New Jersey) | 3,936.06 mi (6,334.48 km) |
| Opfikon to Oak Ridge (Tennessee) | 4,566.82 mi (7,349.58 km) |
| Opfikon to Oakdale (California) | 5,776.17 mi (9,295.85 km) |
| Opfikon to Oakdale (Minnesota) | 4,480.52 mi (7,210.71 km) |
| Opfikon to Oakland (California) | 5,813.41 mi (9,355.78 km) |
| Opfikon to Oakland (New Jersey) | 3,925.40 mi (6,317.32 km) |
| Opfikon to Oakland Park (Florida) | 4,851.45 mi (7,807.65 km) |
| Opfikon to Oakleaf Plantation (Florida) | 4,734.87 mi (7,620.03 km) |
