By air

The simplest is to fly into Paris-Roissy-Charles-de-Gaulles airport, and to take the train straight from the airport (the station is a 5-minute shuttle ride from the airport terminals) to Avignon. The fast trains ("TGV") take less than 3 hours, making this much simpler than flying into, say Nice or even Marseille unless you can fly directly there.

The closest national airport to Saint Victor is Avignon.

There is also now a direct flight London-Nimes on RyanAir. Nimes is 30 minutes from Saint Victor la Coste.

By train

The closest train station is Avignon (25 minutes from Saint Victor). Fast trains from Avignon take less than 3 hours from Paris, half an hour from Marseille, 3 1/2 hours from Geneva.
 

By road

Saint Victor la Coste is only 10 minutes from an exit from the A9 highway (Tavel/Roquemaure exit).