| Niagara Falls to Kidricevo | 4,359.34 mi (7,015.69 km) |
| Niagara Falls to Kobarid | 4,278.61 mi (6,885.76 km) |
| Niagara Falls to Kobilje | 4,371.35 mi (7,035.00 km) |
| Niagara Falls to Kocevje | 4,352.96 mi (7,005.41 km) |
| Niagara Falls to Komen | 4,302.24 mi (6,923.79 km) |
| Niagara Falls to Komenda | 4,318.00 mi (6,949.15 km) |
| Niagara Falls to Koper | 4,311.97 mi (6,939.44 km) |
| Niagara Falls to Kostanjevica na Krki | 4,367.12 mi (7,028.20 km) |
| Niagara Falls to Kostel | 4,360.30 mi (7,017.23 km) |
| Niagara Falls to Kozje | 4,363.27 mi (7,022.01 km) |
| Niagara Falls to Kranj | 4,310.21 mi (6,936.61 km) |
| Niagara Falls to Kranjska Gora | 4,277.56 mi (6,884.07 km) |
| Niagara Falls to Krizevci | 4,366.31 mi (7,026.90 km) |
| Niagara Falls to Krsko | 4,365.26 mi (7,025.22 km) |
| Niagara Falls to Kuzma | 4,353.32 mi (7,006.00 km) |
