The 2025 Donostia San Sebastian Klasikoa was a medium mountain race that took place on .

The race started in Donostia/San Sebastián and finished in Donostia/San Sebastián, starting at with an expected finish at (average speed of 40 km/h).

The total distance of the race was 215 km. The race included 0 categorized climb(s) and 0 intermediate sprint(s), and had a total elevation gain of 4054 m, and a total descent of 4054 m.