Scenic train from St Moritz back to Zurich?

Hello all

I am needing to catch a train back to Zurich on 18th Dec as I have a flight to catch in Zurich at 320pm

Can you please suggest which is the most scenic and efficient way to get there. I will have to catch a relatively early train.

Also do the trains go straight through to the airport terminal at Zurich.

I am failry certain there is a panoramic train and I also have a Swiss travel pass.

Look forward to your advice Many thanks

This discussion continues here: myswissalps.com/forum/ topic/booking-tickets-from-st-moritz-to-zurich.