From Roissy Charles de Gaule airport to Valence, there is few direct TGV (fast trains) which connect in 2h45.
From Marseille airport to Valence, there is a direct TER (slow trains) in 2h30, some TGV (fast train) are also available form Marseille.
From Lyon airport, there is few direct TGV (fast trains) which connect in 20 min, if not you need to go to Lyon through the RhoneExpress schuttle and then take a train (TER or TGV) to Valence.
From Valence Ville train station, you can reach the conference site by walking to Pole Bus, and then take a bus to Briffault (Line 2)
From Valence TGV train station, you can take a TER or a bus to go to Valence Ville train station.
