| Willebroek to Oswego (Illinois) | 4,167.69 mi (6,707.25 km) |
| Willebroek to Oswego (New York) | 3,634.24 mi (5,848.75 km) |
| Willebroek to Otsego (Minnesota) | 4,186.00 mi (6,736.71 km) |
| Willebroek to Ottawa (Illinois) | 4,201.62 mi (6,761.86 km) |
| Willebroek to Ottawa (Kansas) | 4,575.74 mi (7,363.94 km) |
| Willebroek to Ottumwa (Iowa) | 4,350.55 mi (7,001.53 km) |
| Willebroek to Overland (Missouri) | 4,389.03 mi (7,063.46 km) |
| Willebroek to Overland Park (Kansas) | 4,540.06 mi (7,306.52 km) |
| Willebroek to Overlea (Maryland) | 3,815.75 mi (6,140.86 km) |
| Willebroek to Oviedo (Florida) | 4,520.78 mi (7,275.50 km) |
| Willebroek to Owasso (Oklahoma) | 4,715.01 mi (7,588.08 km) |
| Willebroek to Owatonna (Minnesota) | 4,229.33 mi (6,806.45 km) |
| Willebroek to Owensboro (Kentucky) | 4,310.76 mi (6,937.49 km) |
| Willebroek to Owings Mills (Maryland) | 3,824.65 mi (6,155.18 km) |
| Willebroek to Owosso (Michigan) | 3,950.03 mi (6,356.95 km) |
