| Merthyr Tudful to Ianca | 1,473.29 mi (2,371.03 km) |
| Merthyr Tudful to Iasi | 1,414.99 mi (2,277.21 km) |
| Merthyr Tudful to Iernut | 1,292.68 mi (2,080.37 km) |
| Merthyr Tudful to Ineu | 1,191.73 mi (1,917.91 km) |
| Merthyr Tudful to Jibou | 1,226.56 mi (1,973.95 km) |
| Merthyr Tudful to Jilava | 1,441.93 mi (2,320.56 km) |
| Merthyr Tudful to Jimbolia | 1,166.05 mi (1,876.57 km) |
| Merthyr Tudful to Liesti | 1,460.11 mi (2,349.83 km) |
| Merthyr Tudful to Lipova | 1,196.31 mi (1,925.27 km) |
| Merthyr Tudful to Liteni | 1,359.73 mi (2,188.27 km) |
| Merthyr Tudful to Ludus | 1,286.09 mi (2,069.76 km) |
| Merthyr Tudful to Lugoj | 1,218.98 mi (1,961.77 km) |
| Merthyr Tudful to Lupeni | 1,286.04 mi (2,069.68 km) |
| Merthyr Tudful to Magurele | 1,439.29 mi (2,316.31 km) |
| Merthyr Tudful to Mangalia | 1,566.54 mi (2,521.11 km) |
