| Willebroek to Kalisz | 592.01 mi (952.75 km) |
| Willebroek to Kamien Pomorski | 480.69 mi (773.60 km) |
| Willebroek to Kamienna Gora | 507.95 mi (817.47 km) |
| Willebroek to Karczew | 726.72 mi (1,169.54 km) |
| Willebroek to Kartuzy | 620.34 mi (998.34 km) |
| Willebroek to Katowice | 642.88 mi (1,034.61 km) |
| Willebroek to Kedzierzyn-Kozle | 606.39 mi (975.89 km) |
| Willebroek to Kepno | 589.18 mi (948.20 km) |
| Willebroek to Ketrzyn | 742.22 mi (1,194.49 km) |
| Willebroek to Kety | 656.68 mi (1,056.83 km) |
| Willebroek to Kielce | 706.44 mi (1,136.90 km) |
| Willebroek to Kielczow | 555.15 mi (893.42 km) |
| Willebroek to Klobuck | 632.55 mi (1,017.99 km) |
| Willebroek to Klodzko | 538.12 mi (866.03 km) |
| Willebroek to Kluczbork | 601.04 mi (967.28 km) |
