| Boulder to Karditsa | 6,019.42 mi (9,687.33 km) |
| Boulder to Kastoria | 5,935.56 mi (9,552.37 km) |
| Boulder to Katerini | 5,988.93 mi (9,638.25 km) |
| Boulder to Keratsini | 6,151.90 mi (9,900.52 km) |
| Boulder to Kerkyra | 5,939.59 mi (9,558.85 km) |
| Boulder to Kiato | 6,121.15 mi (9,851.05 km) |
| Boulder to Kifisia | 6,151.91 mi (9,900.54 km) |
| Boulder to Kilkis | 5,961.15 mi (9,593.54 km) |
| Boulder to Komotini | 6,033.41 mi (9,709.84 km) |
| Boulder to Korinthos | 6,130.94 mi (9,866.80 km) |
| Boulder to Koropi | 6,163.92 mi (9,919.88 km) |
| Boulder to Korydallos | 6,152.06 mi (9,900.78 km) |
| Boulder to Kos | 6,329.96 mi (10,187.09 km) |
| Boulder to Kozani | 5,964.08 mi (9,598.26 km) |
| Boulder to Lagos | 6,023.38 mi (9,693.70 km) |
