| Welwyn Garden City to Kluczbork | 793.58 mi (1,277.14 km) |
| Welwyn Garden City to Knurow | 825.52 mi (1,328.55 km) |
| Welwyn Garden City to Kobylka | 906.02 mi (1,458.10 km) |
| Welwyn Garden City to Kokoszki | 792.68 mi (1,275.70 km) |
| Welwyn Garden City to Kolbuszowa | 956.63 mi (1,539.55 km) |
| Welwyn Garden City to Kolno | 931.18 mi (1,498.58 km) |
| Welwyn Garden City to Kolo | 799.00 mi (1,285.86 km) |
| Welwyn Garden City to Kolobrzeg | 674.41 mi (1,085.35 km) |
| Welwyn Garden City to Koluszki | 852.00 mi (1,371.17 km) |
| Welwyn Garden City to Komorniki | 717.09 mi (1,154.05 km) |
| Welwyn Garden City to Konin | 783.44 mi (1,260.82 km) |
| Welwyn Garden City to Konskie | 884.43 mi (1,423.36 km) |
| Welwyn Garden City to Konstancin-Jeziorna | 904.54 mi (1,455.72 km) |
| Welwyn Garden City to Konstantynow Lodzki | 832.24 mi (1,339.36 km) |
| Welwyn Garden City to Koronowo | 766.36 mi (1,233.33 km) |
