| Cities | Distance |
|---|---|
| Watford to Opwijk | 203.37 mi (327.29 km) |
| Watford to Ostend | 145.81 mi (234.65 km) |
| Watford to Oud-Heverlee | 226.15 mi (363.95 km) |
| Watford to Oud-Turnhout | 232.55 mi (374.26 km) |
| Watford to Oudenaarde | 181.50 mi (292.09 km) |
| Watford to Oudenburg | 149.88 mi (241.22 km) |
| Watford to Oupeye | 269.52 mi (433.74 km) |
| Watford to Overijse | 221.60 mi (356.63 km) |
| Watford to Overpelt | 252.11 mi (405.73 km) |
| Watford to Paal | 243.99 mi (392.66 km) |
| Watford to Peer | 254.67 mi (409.85 km) |
| Watford to Pepinster | 279.68 mi (450.09 km) |
| Watford to Peruwelz | 189.73 mi (305.33 km) |
| Watford to Perwez | 236.79 mi (381.08 km) |
| Watford to Philippeville | 237.62 mi (382.42 km) |