The closest you can get to Valkmusa National Park by train (vr.fi) is to Kyminlinna in Kotka (14 km) or to Kotka (19 km).

Bus services (jonnejaminne.fi) run on weekdays from Kotka to Vastila and Hirvikoski on road 3562, which passes by the national park. The nearest stop (Vastilantie 849) is about 400 metres from the national park (Simonsaari parking, The Western Oasis Trail).