| Merthyr Tudful to Klaukkala | 1,224.85 mi (1,971.21 km) |
| Merthyr Tudful to Kokkola | 1,268.54 mi (2,041.52 km) |
| Merthyr Tudful to Kontiolahti | 1,432.74 mi (2,305.78 km) |
| Merthyr Tudful to Korsholm | 1,205.07 mi (1,939.38 km) |
| Merthyr Tudful to Kotka | 1,298.52 mi (2,089.77 km) |
| Merthyr Tudful to Kouvola | 1,297.80 mi (2,088.61 km) |
| Merthyr Tudful to Kuhmo | 1,452.78 mi (2,338.03 km) |
| Merthyr Tudful to Kuopio | 1,370.34 mi (2,205.36 km) |
| Merthyr Tudful to Kurikka | 1,209.29 mi (1,946.17 km) |
| Merthyr Tudful to Kuusamo | 1,493.18 mi (2,403.03 km) |
| Merthyr Tudful to Kuusankoski | 1,295.93 mi (2,085.60 km) |
| Merthyr Tudful to Lahti | 1,266.05 mi (2,037.52 km) |
| Merthyr Tudful to Laitila | 1,138.92 mi (1,832.91 km) |
| Merthyr Tudful to Lapinlahti | 1,373.20 mi (2,209.94 km) |
| Merthyr Tudful to Lappeenranta | 1,349.25 mi (2,171.41 km) |
