From Zurich Airport (Kloten)
Option 1 (Tram No. 10 - best option): Follow the signs to tramway "Zürich Flughafen Bahnhof". Buy a ticket for 2 zones. Depending on your needs, you can buy a day ticket valid for 24 hours for all trams and buses in the main zone. Departure with tramway No. 10: From station "Zürich Flughafen, Bahnhof" to direction "Bahnhofplatz/HB"(Center). The tramway departs every 15 minutes between 6 AM and 23 PM. Exit after 30 minutes at station "ETH / Universitätsspital".
Option 2 (Train to Zurich Main Station): Follow the signs "Bahn/Railway" to ticket counters and machines. There are English instructions on the machines; follow them or simply press the left (red) key at the bottom where it says "Zurich City". The machine accepts coins as well as banknotes and gives change. The ticket is valid during the next 2 hours for any train to Zurich as well as for the trams and buses in the city (streetcar / tram). Trains to city centre leave approx. every 10 minutes and take about 10 minutes to reach Zurich main station (Zurich HB). If you plan to stay the whole day, a day ticket (valid 24 hours) is more suitable. You may also take a taxi directly to ETH Campus Zentrum (Down-town campus). It costs around 30-40 sFr. However, in rush hours you are faster and cheaper by train and tram.
From Zurich Main Station
At the main station walk to the head of the train and follow any signs to "Bahnhofplatz" (tram 10, just next to main station) and "Bahnhofstrasse" (tram 6, around 100 m down the Bahnhofstrasse). If you arrived by train and haven't yet got a tram ticket, you must now buy one from the blue ticket machine. Depending on your needs, you can buy a day ticket which is valid for 24 hours for all trams and buses in the main zone (zone 10) of the city or, if all you need is to reach the ETH, press the yellow button.
From the main station you reach ETH Campus Zentrum in six minutes with tram No. 10 (direction Seebach) from tram stop Bahnhofplatz or tram No. 6 (direction Zoo) from tram stop Bahnhofstrasse to the stop ETH / Universitätsspital (the 3rd stop). You may also cross the Limmat river (2-3 minutes) and take the "Polybahn" at Central.