Swiss International Air Lines connects Zurich to many international destinations often several times a day, Lufthansa and Air Berlin offer good connections to/from Germany. Zug can be easily reached from Zurich Airport within 45 minutes by one of the 70 daily direct trains. Take a train towards Zug – Luzern and get of at Zug. When leaving Zug you can check-in for your flight at Zug railway station, at the Reisezentrum Zug.
Please note: Swiss International Air Lines as Official Carrier for the WELS 2019 offers all participants up to 10% discount on the standard fares. More information here.