| Merthyr Tudful to Karis | 1,182.95 mi (1,903.78 km) |
| Merthyr Tudful to Karkkila | 1,210.59 mi (1,948.26 km) |
| Merthyr Tudful to Kauhajoki | 1,197.33 mi (1,926.91 km) |
| Merthyr Tudful to Kauhava | 1,243.04 mi (2,000.48 km) |
| Merthyr Tudful to Kauniainen | 1,221.13 mi (1,965.22 km) |
| Merthyr Tudful to Kemi | 1,370.60 mi (2,205.76 km) |
| Merthyr Tudful to Kemijarvi | 1,473.77 mi (2,371.80 km) |
| Merthyr Tudful to Kempele | 1,366.24 mi (2,198.75 km) |
| Merthyr Tudful to Kerava | 1,236.70 mi (1,990.27 km) |
| Merthyr Tudful to Keuruu | 1,266.43 mi (2,038.13 km) |
| Merthyr Tudful to Kiiminki | 1,380.26 mi (2,221.31 km) |
| Merthyr Tudful to Kirkkonummi | 1,208.76 mi (1,945.30 km) |
| Merthyr Tudful to Kitee | 1,429.09 mi (2,299.90 km) |
| Merthyr Tudful to Kiuruvesi | 1,358.72 mi (2,186.65 km) |
| Merthyr Tudful to Kivisto | 1,226.87 mi (1,974.45 km) |
