| Donegal to Torgelow | 894.14 mi (1,438.98 km) |
| Donegal to Tornesch | 721.94 mi (1,161.85 km) |
| Donegal to Tostedt | 728.67 mi (1,172.69 km) |
| Donegal to Traunreut | 1,000.92 mi (1,610.82 km) |
| Donegal to Traunstein | 1,006.80 mi (1,620.29 km) |
| Donegal to Trebbin | 889.52 mi (1,431.55 km) |
| Donegal to Trebur | 768.39 mi (1,236.61 km) |
| Donegal to Treuchtlingen | 899.10 mi (1,446.96 km) |
| Donegal to Trier | 708.43 mi (1,140.10 km) |
| Donegal to Trittau | 750.50 mi (1,207.81 km) |
| Donegal to Troisdorf | 689.73 mi (1,110.01 km) |
| Donegal to Trossingen | 850.26 mi (1,368.36 km) |
| Donegal to Trostberg an der Alz | 997.67 mi (1,605.60 km) |
| Donegal to Tubingen | 846.86 mi (1,362.89 km) |
| Donegal to Tuttlingen | 860.92 mi (1,385.52 km) |
