| Niagara Falls to Karditsa | 4,902.71 mi (7,890.15 km) |
| Niagara Falls to Kastoria | 4,825.02 mi (7,765.12 km) |
| Niagara Falls to Katerini | 4,885.65 mi (7,862.69 km) |
| Niagara Falls to Keratsini | 5,035.43 mi (8,103.75 km) |
| Niagara Falls to Kerkyra | 4,809.96 mi (7,740.89 km) |
| Niagara Falls to Kiato | 4,998.11 mi (8,043.68 km) |
| Niagara Falls to Kifisia | 5,038.17 mi (8,108.16 km) |
| Niagara Falls to Kilkis | 4,867.95 mi (7,834.20 km) |
| Niagara Falls to Komotini | 4,962.48 mi (7,986.33 km) |
| Niagara Falls to Korinthos | 5,008.65 mi (8,060.64 km) |
| Niagara Falls to Koropi | 5,048.92 mi (8,125.46 km) |
| Niagara Falls to Korydallos | 5,036.02 mi (8,104.69 km) |
| Niagara Falls to Kos | 5,233.57 mi (8,422.62 km) |
| Niagara Falls to Kozani | 4,855.44 mi (7,814.08 km) |
| Niagara Falls to Lagos | 4,948.80 mi (7,964.33 km) |
