| Willebroek to Orangevale (California) | 5,418.11 mi (8,719.61 km) |
| Willebroek to Orchards (Washington) | 5,040.96 mi (8,112.64 km) |
| Willebroek to Orcutt (California) | 5,620.16 mi (9,044.77 km) |
| Willebroek to Oregon (Ohio) | 3,983.56 mi (6,410.91 km) |
| Willebroek to Oregon (Wisconsin) | 4,147.30 mi (6,674.44 km) |
| Willebroek to Oregon City (Oregon) | 5,062.95 mi (8,148.03 km) |
| Willebroek to Orem (Utah) | 5,043.27 mi (8,116.36 km) |
| Willebroek to Orinda (California) | 5,492.73 mi (8,839.69 km) |
| Willebroek to Orland Park (Illinois) | 4,153.56 mi (6,684.50 km) |
| Willebroek to Orlando (Florida) | 4,536.10 mi (7,300.14 km) |
| Willebroek to Ormond Beach (Florida) | 4,485.18 mi (7,218.21 km) |
| Willebroek to Oro Valley (Arizona) | 5,461.70 mi (8,789.75 km) |
| Willebroek to Oroville (California) | 5,379.81 mi (8,657.96 km) |
| Willebroek to Oshkosh (Wisconsin) | 4,065.15 mi (6,542.23 km) |
| Willebroek to Oskaloosa (Iowa) | 4,345.19 mi (6,992.90 km) |
