| Watford to Jozefow | 919.40 mi (1,479.64 km) |
| Watford to Kalisz | 788.98 mi (1,269.74 km) |
| Watford to Kamien Pomorski | 651.93 mi (1,049.18 km) |
| Watford to Kamienna Gora | 712.01 mi (1,145.87 km) |
| Watford to Karczew | 920.51 mi (1,481.41 km) |
| Watford to Kartuzy | 792.63 mi (1,275.62 km) |
| Watford to Katowice | 847.68 mi (1,364.21 km) |
| Watford to Kedzierzyn-Kozle | 811.31 mi (1,305.68 km) |
| Watford to Kepno | 789.37 mi (1,270.37 km) |
| Watford to Ketrzyn | 919.86 mi (1,480.37 km) |
| Watford to Kety | 862.73 mi (1,388.42 km) |
| Watford to Kielce | 907.60 mi (1,460.64 km) |
| Watford to Kielczow | 756.58 mi (1,217.60 km) |
| Watford to Klobuck | 834.38 mi (1,342.80 km) |
| Watford to Klodzko | 743.55 mi (1,196.62 km) |
