| Watford to Oswego (Illinois) | 3,968.61 mi (6,386.86 km) |
| Watford to Oswego (New York) | 3,430.01 mi (5,520.07 km) |
| Watford to Otsego (Minnesota) | 3,994.95 mi (6,429.26 km) |
| Watford to Ottawa (Illinois) | 4,002.56 mi (6,441.50 km) |
| Watford to Ottawa (Kansas) | 4,378.77 mi (7,046.95 km) |
| Watford to Ottumwa (Iowa) | 4,153.74 mi (6,684.79 km) |
| Watford to Overland (Missouri) | 4,188.61 mi (6,740.92 km) |
| Watford to Overland Park (Kansas) | 4,342.91 mi (6,989.25 km) |
| Watford to Overlea (Maryland) | 3,608.80 mi (5,807.81 km) |
| Watford to Oviedo (Florida) | 4,311.64 mi (6,938.91 km) |
| Watford to Owasso (Oklahoma) | 4,516.41 mi (7,268.46 km) |
| Watford to Owatonna (Minnesota) | 4,036.53 mi (6,496.16 km) |
| Watford to Owensboro (Kentucky) | 4,107.61 mi (6,610.56 km) |
| Watford to Owings Mills (Maryland) | 3,617.82 mi (5,822.33 km) |
| Watford to Owosso (Michigan) | 3,749.53 mi (6,034.28 km) |
