| Duffel to Odessa (Texas) | 5,192.10 mi (8,355.88 km) |
| Duffel to Ogden (Utah) | 5,002.71 mi (8,051.09 km) |
| Duffel to Oildale (California) | 5,548.65 mi (8,929.68 km) |
| Duffel to Ojus (Florida) | 4,619.48 mi (7,434.33 km) |
| Duffel to Okemos (Michigan) | 3,976.87 mi (6,400.16 km) |
| Duffel to Oklahoma City (Oklahoma) | 4,824.09 mi (7,763.63 km) |
| Duffel to Okmulgee (Oklahoma) | 4,760.76 mi (7,661.71 km) |
| Duffel to Olathe (Kansas) | 4,549.36 mi (7,321.49 km) |
| Duffel to Old Jamestown (Missouri) | 4,383.32 mi (7,054.27 km) |
| Duffel to Oldsmar (Florida) | 4,618.75 mi (7,433.15 km) |
| Duffel to Olean (New York) | 3,774.90 mi (6,075.12 km) |
| Duffel to Olive Branch (Mississippi) | 4,559.92 mi (7,338.49 km) |
| Duffel to Olivehurst (California) | 5,406.84 mi (8,701.46 km) |
| Duffel to Olney (Maryland) | 3,853.16 mi (6,201.07 km) |
| Duffel to Olympia (Washington) | 4,972.44 mi (8,002.36 km) |
