Take a look over on the right side of the page (over there ->) ... you will see "Top questions about Zurich" and then under that "What can I see with only a few hours in Zurich?"
... I think you will find your answers there!
Have fun planning.
Depending on where you are flying to, you most likely do not need to be at the airport again until 1 or 2 hrs before flight time. You will be checked in and have your boarding pass...so all you will need to do is to go through Security and get to the gate.
The airport is roughly 15mins by train from the middle of Zürich. With all that time at your disposal you could even work in a trip to the Rhine Falls if you like - trains leave, some with connections, quite frequently for the Rhine Falls from the airport. Then come back, continue on into town and walk around the old town for a couple of hours... For train times see www.sbb.ch/en
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