| Duffel to Orangevale (California) | 5,420.57 mi (8,723.57 km) |
| Duffel to Orchards (Washington) | 5,042.89 mi (8,115.75 km) |
| Duffel to Orcutt (California) | 5,622.91 mi (9,049.19 km) |
| Duffel to Oregon (Ohio) | 3,988.23 mi (6,418.44 km) |
| Duffel to Oregon (Wisconsin) | 4,151.56 mi (6,681.28 km) |
| Duffel to Oregon City (Oregon) | 5,064.90 mi (8,151.16 km) |
| Duffel to Orem (Utah) | 5,046.33 mi (8,121.28 km) |
| Duffel to Orinda (California) | 5,495.16 mi (8,843.61 km) |
| Duffel to Orland Park (Illinois) | 4,158.00 mi (6,691.65 km) |
| Duffel to Orlando (Florida) | 4,541.73 mi (7,309.21 km) |
| Duffel to Ormond Beach (Florida) | 4,490.78 mi (7,227.22 km) |
| Duffel to Oro Valley (Arizona) | 5,465.30 mi (8,795.55 km) |
| Duffel to Oroville (California) | 5,382.19 mi (8,661.80 km) |
| Duffel to Oshkosh (Wisconsin) | 4,069.36 mi (6,549.00 km) |
| Duffel to Oskaloosa (Iowa) | 4,349.38 mi (6,999.65 km) |
