| Watford to Karis | 1,089.85 mi (1,753.94 km) |
| Watford to Karkkila | 1,119.35 mi (1,801.41 km) |
| Watford to Kauhajoki | 1,118.33 mi (1,799.78 km) |
| Watford to Kauhava | 1,166.38 mi (1,877.11 km) |
| Watford to Kauniainen | 1,127.85 mi (1,815.10 km) |
| Watford to Kemi | 1,305.17 mi (2,100.46 km) |
| Watford to Kemijarvi | 1,409.47 mi (2,268.33 km) |
| Watford to Kempele | 1,295.62 mi (2,085.11 km) |
| Watford to Kerava | 1,144.03 mi (1,841.14 km) |
| Watford to Keuruu | 1,183.48 mi (1,904.62 km) |
| Watford to Kiiminki | 1,310.40 mi (2,108.88 km) |
| Watford to Kirkkonummi | 1,115.24 mi (1,794.80 km) |
| Watford to Kitee | 1,340.85 mi (2,157.89 km) |
| Watford to Kiuruvesi | 1,280.69 mi (2,061.08 km) |
| Watford to Kivisto | 1,134.03 mi (1,825.04 km) |
