| Welwyn Garden City to Karditsa | 1,362.30 mi (2,192.41 km) |
| Welwyn Garden City to Kastoria | 1,281.47 mi (2,062.33 km) |
| Welwyn Garden City to Katerini | 1,339.95 mi (2,156.44 km) |
| Welwyn Garden City to Keratsini | 1,495.59 mi (2,406.91 km) |
| Welwyn Garden City to Kerkyra | 1,276.87 mi (2,054.92 km) |
| Welwyn Garden City to Kiato | 1,461.60 mi (2,352.22 km) |
| Welwyn Garden City to Kifisia | 1,497.06 mi (2,409.29 km) |
| Welwyn Garden City to Kilkis | 1,320.09 mi (2,124.48 km) |
| Welwyn Garden City to Komotini | 1,414.77 mi (2,276.86 km) |
| Welwyn Garden City to Korinthos | 1,471.76 mi (2,368.57 km) |
| Welwyn Garden City to Koropi | 1,508.45 mi (2,427.61 km) |
| Welwyn Garden City to Korydallos | 1,495.97 mi (2,407.53 km) |
| Welwyn Garden City to Kos | 1,687.54 mi (2,715.83 km) |
| Welwyn Garden City to Kozani | 1,311.33 mi (2,110.38 km) |
| Welwyn Garden City to Lagos | 1,400.71 mi (2,254.23 km) |
