| Letterkenny to Thorigny-sur-Marne | 610.25 mi (982.10 km) |
| Letterkenny to Thouare-sur-Loire | 596.42 mi (959.85 km) |
| Letterkenny to Thouars | 640.09 mi (1,030.13 km) |
| Letterkenny to Tinqueux | 633.04 mi (1,018.78 km) |
| Letterkenny to Tomblaine | 733.91 mi (1,181.11 km) |
| Letterkenny to Tonneins | 812.35 mi (1,307.35 km) |
| Letterkenny to Torcy | 609.97 mi (981.65 km) |
| Letterkenny to Toul | 723.49 mi (1,164.35 km) |
| Letterkenny to Toulon | 1,021.10 mi (1,643.30 km) |
| Letterkenny to Toulouse | 884.76 mi (1,423.88 km) |
| Letterkenny to Tourcoing | 539.25 mi (867.84 km) |
| Letterkenny to Tourlaville | 449.34 mi (723.14 km) |
| Letterkenny to Tournan-en-Brie | 619.16 mi (996.44 km) |
| Letterkenny to Tournefeuille | 883.92 mi (1,422.53 km) |
| Letterkenny to Tournon-sur-Rhone | 879.07 mi (1,414.72 km) |
