| Niederkassel to Kobarid | 434.85 mi (699.83 km) |
| Niederkassel to Kobilje | 512.67 mi (825.06 km) |
| Niederkassel to Kocevje | 506.95 mi (815.86 km) |
| Niederkassel to Komen | 462.93 mi (745.01 km) |
| Niederkassel to Komenda | 468.03 mi (753.22 km) |
| Niederkassel to Koper | 476.77 mi (767.28 km) |
| Niederkassel to Kostanjevica na Krki | 515.68 mi (829.91 km) |
| Niederkassel to Kostel | 515.47 mi (829.57 km) |
| Niederkassel to Kozje | 509.40 mi (819.80 km) |
| Niederkassel to Kranj | 461.00 mi (741.91 km) |
| Niederkassel to Kranjska Gora | 429.32 mi (690.92 km) |
| Niederkassel to Krizevci | 508.24 mi (817.93 km) |
| Niederkassel to Krsko | 512.67 mi (825.07 km) |
| Niederkassel to Kuzma | 494.66 mi (796.07 km) |
| Niederkassel to Lasko | 494.34 mi (795.56 km) |
