| Duffel to Oswego (Illinois) | 4,172.10 mi (6,714.34 km) |
| Duffel to Oswego (New York) | 3,639.12 mi (5,856.60 km) |
| Duffel to Otsego (Minnesota) | 4,189.82 mi (6,742.87 km) |
| Duffel to Ottawa (Illinois) | 4,206.03 mi (6,768.95 km) |
| Duffel to Ottawa (Kansas) | 4,579.97 mi (7,370.76 km) |
| Duffel to Ottumwa (Iowa) | 4,354.77 mi (7,008.33 km) |
| Duffel to Overland (Missouri) | 4,393.54 mi (7,070.72 km) |
| Duffel to Overland Park (Kansas) | 4,544.31 mi (7,313.37 km) |
| Duffel to Overlea (Maryland) | 3,820.95 mi (6,149.22 km) |
| Duffel to Oviedo (Florida) | 4,526.41 mi (7,284.56 km) |
| Duffel to Owasso (Oklahoma) | 4,719.37 mi (7,595.10 km) |
| Duffel to Owatonna (Minnesota) | 4,233.27 mi (6,812.80 km) |
| Duffel to Owensboro (Kentucky) | 4,315.52 mi (6,945.16 km) |
| Duffel to Owings Mills (Maryland) | 3,829.83 mi (6,163.51 km) |
| Duffel to Owosso (Michigan) | 3,954.56 mi (6,364.24 km) |
