| Merthyr Tudful to Trezzo sull'Adda | 723.51 mi (1,164.37 km) |
| Merthyr Tudful to Tricase | 1,318.48 mi (2,121.88 km) |
| Merthyr Tudful to Trieste | 885.10 mi (1,424.44 km) |
| Merthyr Tudful to Triggiano | 1,209.24 mi (1,946.08 km) |
| Merthyr Tudful to Trinitapoli | 1,165.25 mi (1,875.29 km) |
| Merthyr Tudful to Trissino | 794.65 mi (1,278.87 km) |
| Merthyr Tudful to Triuggio | 711.62 mi (1,145.24 km) |
| Merthyr Tudful to Trofarello | 690.22 mi (1,110.81 km) |
| Merthyr Tudful to Troina | 1,299.90 mi (2,091.98 km) |
| Merthyr Tudful to Turin | 683.50 mi (1,099.99 km) |
| Merthyr Tudful to Udine | 847.58 mi (1,364.05 km) |
| Merthyr Tudful to Ugento | 1,311.05 mi (2,109.94 km) |
| Merthyr Tudful to Umbertide | 933.50 mi (1,502.33 km) |
| Merthyr Tudful to Urbino | 924.45 mi (1,487.75 km) |
| Merthyr Tudful to Urgnano | 730.48 mi (1,175.59 km) |
