Train:
Train services are possible to Chur with a 40 minute transfer up to the Flims.
Driving:
Via Zurich, head south on the E3 to Chur and then head west on the route 19 to Flims via Laax. Zurich to resorts = 88 miles. Drive time from Calais is 10 hours. 585 miles (941 km).
Flying:
Fly to Zurich, airport, about 3 hours away.