| Willebroek to Odessa (Texas) | 5,187.87 mi (8,349.07 km) |
| Willebroek to Ogden (Utah) | 4,999.74 mi (8,046.30 km) |
| Willebroek to Oildale (California) | 5,545.82 mi (8,925.14 km) |
| Willebroek to Ojus (Florida) | 4,613.66 mi (7,424.97 km) |
| Willebroek to Okemos (Michigan) | 3,972.33 mi (6,392.85 km) |
| Willebroek to Oklahoma City (Oklahoma) | 4,819.78 mi (7,756.69 km) |
| Willebroek to Okmulgee (Oklahoma) | 4,756.37 mi (7,654.63 km) |
| Willebroek to Olathe (Kansas) | 4,545.12 mi (7,314.66 km) |
| Willebroek to Old Jamestown (Missouri) | 4,378.81 mi (7,047.01 km) |
| Willebroek to Oldsmar (Florida) | 4,613.16 mi (7,424.16 km) |
| Willebroek to Olean (New York) | 3,770.01 mi (6,067.24 km) |
| Willebroek to Olive Branch (Mississippi) | 4,555.12 mi (7,330.76 km) |
| Willebroek to Olivehurst (California) | 5,404.43 mi (8,697.58 km) |
| Willebroek to Olney (Maryland) | 3,847.98 mi (6,192.72 km) |
| Willebroek to Olympia (Washington) | 4,970.62 mi (7,999.44 km) |
