By air

Airport Mulhouse-Basel at 1 hour 15 drive time.

From the airport, we really recommend hiring a car....
If you prefer public transport, you’ll need to take a bus to Saint Louis, then the train to Mulhouse and Thann, getting off at Wesserling station. 
Public transport stops at the foot of the Col de Bussang. You will then need to take a taxi or try carpooling (Blablacar,...) to reach the village of Bussang, where the Fluo bus line 2 serves the valley as far as Remiremont station.