| Idstein to Karis | 907.95 mi (1,461.20 km) |
| Idstein to Karkkila | 943.39 mi (1,518.24 km) |
| Idstein to Kauhajoki | 993.14 mi (1,598.30 km) |
| Idstein to Kauhava | 1,046.73 mi (1,684.55 km) |
| Idstein to Kauniainen | 942.44 mi (1,516.71 km) |
| Idstein to Kemi | 1,218.49 mi (1,960.98 km) |
| Idstein to Kemijarvi | 1,321.11 mi (2,126.13 km) |
| Idstein to Kempele | 1,190.48 mi (1,915.89 km) |
| Idstein to Kerava | 960.19 mi (1,545.27 km) |
| Idstein to Keuruu | 1,037.67 mi (1,669.97 km) |
| Idstein to Kiiminki | 1,207.18 mi (1,942.77 km) |
| Idstein to Kirkkonummi | 929.66 mi (1,496.15 km) |
| Idstein to Kitee | 1,164.36 mi (1,873.85 km) |
| Idstein to Kiuruvesi | 1,148.26 mi (1,847.95 km) |
| Idstein to Kivisto | 950.12 mi (1,529.07 km) |
