| Watford to Islahiye | 2,059.64 mi (3,314.67 km) |
| Watford to Isparta | 1,777.17 mi (2,860.08 km) |
| Watford to Istanbul | 1,566.63 mi (2,521.25 km) |
| Watford to Izmir | 1,610.55 mi (2,591.92 km) |
| Watford to Kadinhani | 1,822.28 mi (2,932.67 km) |
| Watford to Kadirli | 2,021.82 mi (3,253.80 km) |
| Watford to Kagithane | 1,564.63 mi (2,518.03 km) |
| Watford to Kahramanmaras | 2,046.82 mi (3,294.05 km) |
| Watford to Kahta | 2,108.71 mi (3,393.63 km) |
| Watford to Kaman | 1,834.96 mi (2,953.08 km) |
| Watford to Kangal | 1,993.64 mi (3,208.45 km) |
| Watford to Kapakli | 1,512.49 mi (2,434.12 km) |
| Watford to Karaagac | 2,059.97 mi (3,315.19 km) |
| Watford to Karaagac | 1,513.22 mi (2,435.29 km) |
| Watford to Karabuk | 1,711.55 mi (2,754.47 km) |
