| Siena to Karis | 1,267.44 mi (2,039.75 km) |
| Siena to Karkkila | 1,304.60 mi (2,099.55 km) |
| Siena to Kauhajoki | 1,391.54 mi (2,239.47 km) |
| Siena to Kauhava | 1,445.11 mi (2,325.69 km) |
| Siena to Kauniainen | 1,294.88 mi (2,083.91 km) |
| Siena to Kemi | 1,629.35 mi (2,622.18 km) |
| Siena to Kemijarvi | 1,725.68 mi (2,777.22 km) |
| Siena to Kempele | 1,590.02 mi (2,558.89 km) |
| Siena to Kerava | 1,312.26 mi (2,111.89 km) |
| Siena to Keuruu | 1,416.43 mi (2,279.52 km) |
| Siena to Kiiminki | 1,607.14 mi (2,586.45 km) |
| Siena to Kirkkonummi | 1,283.31 mi (2,065.29 km) |
| Siena to Kitee | 1,505.17 mi (2,422.34 km) |
| Siena to Kiuruvesi | 1,529.65 mi (2,461.73 km) |
| Siena to Kivisto | 1,303.18 mi (2,097.27 km) |
