| Merthyr Tudful to Lapua | 1,237.38 mi (1,991.37 km) |
| Merthyr Tudful to Laukaa | 1,307.51 mi (2,104.23 km) |
| Merthyr Tudful to Lauritsala | 1,351.80 mi (2,175.51 km) |
| Merthyr Tudful to Lempaala | 1,213.58 mi (1,953.07 km) |
| Merthyr Tudful to Leppavirta | 1,364.55 mi (2,196.03 km) |
| Merthyr Tudful to Lieksa | 1,448.97 mi (2,331.89 km) |
| Merthyr Tudful to Lieto | 1,152.99 mi (1,855.56 km) |
| Merthyr Tudful to Liminka | 1,360.50 mi (2,189.52 km) |
| Merthyr Tudful to Liperi | 1,413.94 mi (2,275.52 km) |
| Merthyr Tudful to Lohja | 1,199.86 mi (1,930.99 km) |
| Merthyr Tudful to Loimaa | 1,180.65 mi (1,900.08 km) |
| Merthyr Tudful to Loviisa | 1,275.01 mi (2,051.93 km) |
| Merthyr Tudful to Mantsala | 1,248.30 mi (2,008.94 km) |
| Merthyr Tudful to Mariehamn | 1,062.69 mi (1,710.24 km) |
| Merthyr Tudful to Masku | 1,143.56 mi (1,840.37 km) |
